Malicious PDF — malware analysis report

Static analysis result for SHA-256 0407067b8b360cd9…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 10:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88aac26bf7ef59a299ff87862bd7e676 SHA-1: 8463f0bf54b2cbab073c12d568d402bad3e3c16a SHA-256: 0407067b8b360cd91b25b982b77b1fd8d4b8ac78389bc4bb67b37c7ea08e49a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm used to distribute malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecdffe9e00ec34a300614d7ddf1949e3/napokamotenagakidugira.pdf In PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/t6mib9bah99ukncum6qpjttjp0/36231627107.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbcd5ddea2---dudogetetujoji.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868821e97bf---bukojaxikokel.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/auhvvu829r5c6osc1a2djpf3na/kigegeti.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622755c06d---pavixutemapula.pdfIn PDF document text
    • https://equinox-e.com/upload/files/lusuroxe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d1fc93d14---sajuvomuvamet.pdfIn PDF document text
    • http://abc-tel.ru/data/File/71677960837.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cml9rvg2u40taqmr1budl8531k/68967542600.pdfIn PDF document text
    • http://fkhd.cz/data/img/womurami.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08933bdc3c---47747638817.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/45b88c4fe7ac1ef8fc8544117775febe/5581287182.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f53959de824af7b894dd3913f113fbae/mabuwuxotelolufir.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021051921575973499.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c27590799c8fd8e9acb8b35629840ec9/60528795039.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1ca89c3c13c5bb4e5d3f2264619ae01c/12803230846.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e02e86840---kaliruvurubewazigazu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92d5cfb98---ferizowenutalonoropabusoz.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/wavowul.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/32054822440.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ddf689683be95a795636962cab1bcfc0/44717431241.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cle4u6de55bteioc8ha695s3lj/gidikepesa.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/wezusiwolurobepeg.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/31212499895.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/desomijogenunulov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=village+by+the+sea+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 16820 bytes
SHA-256: 2254058598c68a582bc560aab1e337938af20f50419df7f51c527fe1a91077b9
font_01_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 11084 bytes
SHA-256: ce81a00f3ea0fb218331c9ecd53722fa8fc3a40d00409dc08a915fe6fab87465
font_02_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000147bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BD 16680 bytes
SHA-256: 57274db3b0d273db7f16841a0a809d19e3f7569080801e32124a9344979cebdf

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