Malicious PDF — malware analysis report

Static analysis result for SHA-256 deecbe3bc13d1516…

MALICIOUS

PDF

80.9 KB Created: 2021-08-17 19:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57c2496e8149b18649c07cbd28b58589 SHA-1: e746f8cabf05741a8dd9c0c94053f623196d2142 SHA-256: deecbe3bc13d151601e30b7355d1e4638ec7640bfd3cf89241aa80e5b0f37274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious destinations. The document body is unreadable, but the presence of a link farm on compromised infrastructure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+to+unlock+bully+dog+bdx+tuner PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a1a0190d96c2ed8efcb04e64c737f80f/fimuvilakisefezono.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210505080624144.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a88579ce3---57640466424.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/weregi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4ghji5j9922da4iqgt49utidr4/zozulipatoru.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/86511920075.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/mifemofexaxixugavuzora.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/kexox.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/71453524913.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/05/losafuwefitexumafisojonap.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/61544500322.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/kexarizatalekekamujixo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a2d954f2---34266754920.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/59368446575.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ca8f50533ed3733060cdc360aeb8ca9a/32322046321.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/8742cd5ff3a2d37a4dd9986d4cd75028/sodokekis.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kunuja.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/desuvunodeperiguxowu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2p80htjfgfsqiqv42t5799t409/20275961491.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/39692035553.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/fugitiwukebuner.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/10941377137.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/41694473619.pdfIn PDF document text
    • 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_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 10748 bytes
SHA-256: c7630c51f18a06c99f314d47adf82fddb8addd43d9940fd494f7338fbf32e4a6
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 17380 bytes
SHA-256: 2d8fb4dc8c5f4c3021164418277f22ec58a36dbf8213cb10b097ec4317c7167e