Malicious PDF — malware analysis report

Static analysis result for SHA-256 3371821ba217620d…

MALICIOUS

PDF

74.1 KB Created: 2021-06-25 13:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1f1b37b73bd4ba83e00be5db9b265e8 SHA-1: d7efb05b2461951204828e183c92dcdaf29e6527 SHA-256: 3371821ba217620d0710c673c6cbaff08f23e2b737633386e7db13bede67d15a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/43c87aae60aed1708b2c64e2770081ad/83208543778.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/078eec25d9088aeef1553403cf079c15/63686052643.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/onuq2rg4rqerlq85hb12gj8u22/pepum.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021632338515516.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5ck603fbnpphhvs9gl0aqujsdl/34220067289.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j7dn9unnclapool3f5cktgqgn6/modiditegafotineborobos.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff723430e2---7204479237.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eaa3a609f---15097487503.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/18e1721fud3eaqucr0qm74da33/pivagubuxoxezotu.pdf
    • http://hondasushi.com/uploads/files/ketawiju.pdf
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/pekepu.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jn6g4nmqjnf4l5423hrg8h001f/76024169547.pdf
    • http://sinproval.it/userfiles/files/98151066184.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/69714500718.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/a4k9qr2g86fid71so7jup6odga/93630701812.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=us+stock+futures+now
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be5f.bin
e092bc88db51b4ba1bceb4f68874944da0886d95933d49c47621a222476c56cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 17600 bytes
font_01_sfnt_off0000ecb3.bin
09444580b14758b4d36cf5cbccbc380775d42eb92e5b56101b61e7a80e675f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 10316 bytes
font_02_sfnt_off0001043b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16792 bytes

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