Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b85164563d73f2…

MALICIOUS

PDF

86.5 KB Created: 2021-07-15 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d1819e5437bf5bebdd2620b95bdedcf9 SHA-1: 8d11d1c088f817482b7e1bc08a7721b1b65fe530 SHA-256: d1b85164563d73f2b95facf30b548131f87c77e7bca2f5ae0d0e135fd1d3976e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a payment redirection lure. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish for financial details. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or financial fraud attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://gilbertems.com/videos/file/vavajorimoxiv.pdf In PDF document text
    • http://europavloeren.nl/siteimages/file/xuxegalulaponop.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f40f30f87---18729768320.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/veluvadozupevotixopoxuva.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7b53636799642c1f57a71765c0c16cb5/xojuraluminefamu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd12024b37---60063910752.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798139acf99---gavusix.pdfIn PDF document text
    • http://aven.su/userfiles/file/kezabik.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m4sk84ro1vf09fcto5hhp1h4q6/99925736965.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kt5j53v741ku7kftn59tn75d15/98590651891.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ab7dac01---1121481742.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/g83g650gand1qc5q2re0hinuef/61803316700.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/68056414785.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lp38lad6gem9a2toqk4clar833/dumexisojibazukuninopix.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3kto459la6u5ma7kbbk27kvvf1/tukuwoteropu.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/dazitadiliz.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/laboma.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee31b3e916---71740625045.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/6ec2305a22fc1896db544373e6200cb8/7472808152.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3sdg9mker4950o81fs5q8ji883/jegore.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77347d9b1e---dazumiwozepelogojuw.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/wikadewuzamigof.pdfIn PDF document text
    • https://mmszke.hu/files/file/soxavawugodobilapa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/62a55793d16d460f27fdbac321e046ef/28665953838.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6cbc6cbc435dd6d8f308d5de2b5ebe02/bifidopapu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/takubatonet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=addition+and+subtraction+positive+and+negative+numbersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 17108 bytes
SHA-256: 28213e858c14a5ab2feaeb344befc6801672fd169371d8c7dead1fe755c112c8
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 11096 bytes
SHA-256: 25bdaebd805cb4f5b4a429a9d62d7799ae857a0a376224168db80ec523fb8b85

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