Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61a1ec5a3b44f3d…

MALICIOUS

PDF

89.9 KB Created: 2021-08-17 13:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 41c6312e4480fc0c676b09523e706366 SHA-1: 27855f52c3e7c6a1b39549d8423c734734a0092f SHA-256: b61a1ec5a3b44f3dd556f6cd92b81e450b04ac3f5386d6deb45f1a340450e24e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vchmra34vb6bfl0phpsg2e3nrn/zuvinosuvopegedo.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bab4557fc---tolubifuv.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ml05biam003miaa78kr9ld2v67/donixoku.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/nibidebofe.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160805353939d9---39657179893.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/bepedal.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/musixalanenugo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a6857e81---nolonuzupikofuvebapi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/gazototavuz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d034d9839bd---86586912927.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/7391516147.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/61579351557.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756a6b7cb59---fefufebex.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/getunipulix.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/satewixulapirelijawude.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9caf9c117620e0fa91b24ff9c134a11e/29004787525.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/xunako.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d7a1caa760b878b68d83f9fd19cb7bad/20317676478.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072242215a4e---29381331003.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/32890947071.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/mumupevipuw.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/73300567250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+tell+what+size+your+gucci+belt+isPDF 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_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10896 bytes
SHA-256: 4c217cfa64a4ba60cc67bfa6fea0476663307bdfc0f2553fe423008a4c0d5642
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 19556 bytes
SHA-256: 023eba2e4299dfb137288407cb7a5defa8adf95147225cd1933970fcc11b8588
font_02_sfnt_off00013f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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