Malicious PDF — malware analysis report

Static analysis result for SHA-256 603bd57be6b7dd0b…

MALICIOUS

PDF

86.7 KB Created: 2021-07-24 15:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4aa85ea407616a28178aa5bab6b9a0d8 SHA-1: 6b0fefc4d267834c856ead6ff4ab0c085bac60a8 SHA-256: 603bd57be6b7dd0bcba511288000c3cb29ab909234491c08ccb4013cbb7fc828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external links, many hosted on compromised WordPress sites or disposable domains, suggest a phishing or scamming attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://bio86.fr/fichiers/zovomijevitizixofad.pdf In PDF document text
    • https://tramtron.vn/uploads/files/files/razudeze.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5641c3dac10a1f6c69727cd60eda90a7/77231433700.pdfIn PDF document text
    • https://lecachet.fr/docs/files/62558730501.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/1113129537.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40bcbe838---10621284313.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f32fbc5e8---126234558.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/zarovozatogola.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/85004809488.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/94964523687.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cecd0335e31---jagogopere.pdfIn PDF document text
    • http://seamacros.com/upload/file/1747213082.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/66b649ca13be288b20ad9f536e8456ca/53341995011.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/dagipubelara.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff505cdd26---93678901988.pdfIn PDF document text
    • http://premium-h.info/files/files/rejetalenibenibak.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a36338f3---lukenumiluburukebi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b676296ac5a---lodonefaluridalabu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aueak11vbg2jtnfrjnsnq2irc5/relezabutokadefopijigoki.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/62b892fbda4430a21c0f9be3481067d9/92454447183.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25380da00c---weragibububu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb805675b---detoboxem.pdfIn PDF document text
    • https://angkalaris.com/contents//files/67091929421.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/93060288904.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/kavutude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+the+gazelle+edgePDF 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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 16820 bytes
SHA-256: b4cd96486753373f5e2047b2db1b41727da1f92434a5ff3446d0442408245007
font_01_sfnt_off00011d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1A 10468 bytes
SHA-256: b79b59761b4fe0b9637b82f2a5a7ba8fef4862f94090c744ee7f8e99430c0b7a
font_02_sfnt_off000134ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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