Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8aa86a37a3d5f1…

MALICIOUS

PDF

93.2 KB Created: 2021-06-25 13:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e31de58b18ba97df97c568b30a23a76 SHA-1: f06e9c1be374788fd2507addf5747b5e89734690 SHA-256: fd8aa86a37a3d5f13b88bba6be12041c7ba9f27dce64b49dc72774709ba7a81d
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/5873ad6e4feab5d344af04d5768b96d6/14158751279.pdf
    • http://marmaraisg.com/images_upload/files/wajodez.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1e7eb0e909e44473f00622d6a026feaf/votikofozekesitazokaj.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607df686ef12e---nizetarufogaj.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc474059f---ronovokexepexa.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d7c28a7be---dufewikalan.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/60dc7bb4339a31fdbf67921b9b376791/vaxavirenexijetuz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f932d8eb4---32732970929.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f0aee1c99b34fb37711b4378fe458b96/65579734236.pdf
    • http://www.annaleehuber.com/content_files/file/loxifosogumado.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c59f1a51496689142838e5b142fceb63/dexisenavixaguruv.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ec00f6c0---11822875333.pdf
    • http://bike-aholic.com/UserFiles/file/52516564975.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/22da67b252c1f5def8affd74d87abd9b/xifowanitibosumozujudidex.pdf
    • http://igorodstore.ru/files/userfiles/files/dujuwakabawudebexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=strict+disciplinarian+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e333.bin
ed91322c49e42651e17920d463d967579aaa85478d743181a1563a3241d5ea86
pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 18940 bytes
font_01_sfnt_off00011293.bin
b6f705fc76c07845068629924ba2182c3ad49e86535ad06a629a6269f0e6abe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 10812 bytes
font_02_sfnt_off00012b3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 16792 bytes
font_03_sfnt_off00014348.bin
9182b59df46aaa6166144246936b5ff769f66f200d7ef24d705d0c5b50f8a208
pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 2840 bytes
font_04_sfnt_off00014f1b.bin
19975e242611ff7121403f2d6f7229c6d4b794260efd12df60f55b5abf1142e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1B 16808 bytes