Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4615f0fbac420a…

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 18:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f946f1ab770c94b831105a9c24e6353 SHA-1: 3ffbb1ace9acad718bb999c0b95de9a8280a6be6 SHA-256: 5c4615f0fbac420a97c6489d4b72708d7d94e5d765d17ba5b7cb2d7ba6b9b7ff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://allytemp.ru/uplcv?utm_term=driving+home+for+christmas+sheet+music+pdf+free PDF link annotation
    • http://alexlunacoach.com/img/editor/file/14571780669.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/rorujexuwajapugos.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/55133843968.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4c76a65e---pefofagexajipusojag.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/5564838243.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/46009770836.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/lewemasotagera.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0605/e76ffe5d9e9d6109f0cdce6aefd3f040.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684af78cdb---timevinifewajotirajonu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160942f9b0a6b6---53042445787.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846e5ca50b---97426753407.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/rugatimepemebubovefivu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c1d59318775cb0c7b93bc8e0914d2fa0/divopomojetimakalixot.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1k2shguggnqr1of6utamh6cpve/bajumisazatow.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4479e7fad---20136450026.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf10a4289---diwobogotiz.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/2ca74bfef1097bacd05a73400780209f/nasigojovib.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/soturonuveledujonudo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/31324603433.pdfIn PDF document text
    • https://wsbtitan.com/images/file/pexenarulex.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/tinixadurudawus.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_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 11188 bytes
SHA-256: 43aeac08ada30bcdd4a00bc989f8262f872fc6bf281627b43ca86e16f0459318
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 17228 bytes
SHA-256: 54ad431ef975a5683701a6c449561f299c2750cfecf55fd3368297e2607c2701
font_02_sfnt_off000142e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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