Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0351fa94bfb246…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 05:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d1fe673e67c6f14f5cb718d34a20a01 SHA-1: 1ac045603fe701241ff6c27caed6739f0edd4a7f SHA-256: ef0351fa94bfb2465f84b18c4cc2805003da04423441714c66dddeee419cc8b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised or disposable. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://faguaflowers.com/images/admin/file/zuxanoduvozosunipopu.pdf In PDF document text
    • http://csim.jp/ckeditor/uploads/files/87195775042.pdfIn PDF document text
    • http://hotel-la-licorne.fr/userfiles/file/xiren.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/46609805952.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8a0fe2bef2ce3861d9b4179635f551bc/5578243406.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6385a0e8---disujezu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3006f1710b---21594529930.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/butizigedegoza.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/dokutokepu.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/foretifatinagirigagun.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077332b3afb1---23965529099.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/1300138212.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/7079358243.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e3cfdb54609---bifilevu.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/xiliziramowibetefe.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d23d63d8---54187545316.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a352553642c---85237450558.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e215fadfa3---59405449540.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/34136826261.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/reluvusobogov.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf2a1522cd---refojuketonewidir.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ilvrf7hi23ajpos85tbolsanm2/11387587242.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/gedujevikiras.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/36146546794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hernando+county+property+appraiser+searchPDF 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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 10768 bytes
SHA-256: 319515190c40e53806e76e874b08a1f35a695e650955e579d15b4cb69dcaf058
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 17636 bytes
SHA-256: 0c3adead715c1efe7f8478a8e1a9719c23b30b0437be3078064a4540a4835640

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