Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6e4afac712b0ae…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 23:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 217388ac1457bfbad9236aff71697a02 SHA-1: fb6f1cedb933a70bbe2d9864d1903f121cd8c5f1 SHA-256: bf6e4afac712b0ae319ffdb0461d02d6c6b4f85987e4cb88012cd0d8bf2d7123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to lure victims into clicking malicious links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=ap+biology+multiple+choice+questions+and+answers
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609117dd246bb---negomibogepolisebe.pdf
    • http://auburn-properties.com/userfiles/files/xoruvozin.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bazanuzosabafatu.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fcc61b08e---mukiwipebaxuxusu.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794088a8b12---85658820723.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e583b741a5---28553092704.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e1742cd7---jidefuzenoraju.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mm0np82m8onik97arop15pfe4r/52471061455.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a20a07b79a---7805515797.pdf
    • http://universalgroupautos.com/files/others/51645289538.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9acc3f39---bevolemosoledudumemi.pdf
    • http://akcjonariusz.com/UserFiles/file/fotivu.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ttlbp1t9t16sk0mava3e229071/79792170185.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9a2d4d00bf168d05124a7736aabdd2aa/lutasifutabemogavula.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8b499b24---dipizabu.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0355d4c58d705caec3c1558f6df5749b/pisikokematujukimo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743a066617---59818706615.pdf
    • https://rugsinc.in/UserFiles/files/buwadexatojoluboderonije.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/197a0ff19563081318bce8fb8993cf75/71796371336.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a188d6705c---85877697931.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/06d52ec882b32b885f395b619802737a/26489099996.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498fbb2093---xesobala.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502005630587742.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/97866419fc62b0815cd97b22c0c4aad5/pimaretamubive.pdf
    • 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_off000108bb.bin
3ebb6a089d871844164167c5cbd2762c3e80a21098d3ac99464fab8fbc1fa7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 18140 bytes
font_01_sfnt_off000137e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137E3 16792 bytes
font_02_sfnt_off00014ffa.bin
24768ecc6d420ba087924d62657795af18fd8d1e2340190374fc8708d0796b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFA 11528 bytes

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