Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2bc259a7a6240e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 17:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 951b4cb6438e77669d0dfd09120c65a7 SHA-1: 70387488af0d2c5759709c0f763ac2eb6c7179b5 SHA-256: bf2bc259a7a6240ee1d8db590746e945b927f187db99e8c8d9c1ce6115d3f11e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://itandem.net/ckfinder/userfiles/files/48150952481.pdf In PDF document text
    • http://ancient-theater.gr/media/file/kewubokurijegazavokefefaj.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/41695324965.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/77360168965.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4228a57202---35074959156.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d01d4a134---34933896031.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/79429818711.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d98e828c96---sofogopix.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/bigemikajimesigejuvunir.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/vomajosivinaka.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a420149810---8546306813.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/36580319288.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/33385862453f94eee8e87d1d39fbf04f/jetojomu.pdfIn PDF document text
    • http://altinay-law.com/images/file/kunenabedidotosejifapali.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfceba19c59---kipuwaduzalurolakudib.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/72846664263.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/nipupubeza.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gcgqem85sr8gn94cil48gl4a8o/44893100696.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/59789256679.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/15814911844.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/kiduxemewane.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/28470800180.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773fe3e9db1---besidevulukikirazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=practice+reading+graduated+cylinder+worksheetPDF 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_off0000b8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16288 bytes
SHA-256: e1b64d750fdb23f5c8709daa598fcffbb7d51a94e2b5cff17b299112336091b8
font_02_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 11044 bytes
SHA-256: a8e0c027bb9920eab622617c061deb369f2659ad374b796bec0709d0ae0511fc

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