Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45063678310abcd…

MALICIOUS

PDF

96.8 KB Created: 2021-07-08 07:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb56bda8a80a7c143b1d8ad270300892 SHA-1: a7d0d148487cc20471dbc16f867f6770f0dc7b44 SHA-256: a45063678310abcdd65844b3e2d6dd94517cec5b98fcc0d9d252edcbccc96c56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links serve as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4153f9a58c8b9e64fd5bc33194883a74/boxowejamuvuv.pdf
    • https://callmarkinvestments.com/callmark/files/77078108089.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353d1e5522---45253672810.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608979b856e0b---91869882908.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/872b626ae10d8bb2e0956286ebb213cd/fidoduxo.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0219bd4e8a801a5df80c7d48e219f707/26167877395.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab25af378---lobobejinobeba.pdf
    • http://c2r-auto.com/uploadfiles/file/2021060803275673499.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a29d5735da1---65277030077.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/15202258850.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sv48ok2rd0p1b7tn15efijn802/vofajokudanarebun.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5f3c9163aefebe3cdd94ee63f18e99c1/nadokolad.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6f263a1e21418230bf93b2be996d4a36/48504540288.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8127cc14b5---32280718448.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608316d170312---tunoludav.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21f4a8a0b5---wudolikurozetubewudenele.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4cd6df17---97383342281.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c9325ec55d7d1a4575a9f6be7c60294d/88130516501.pdf
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65319363841.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42d7c8c4b---sukegokogogibazitedifaj.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/99190838932.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/39303423652.pdf
    • https://catbasailing.com/upload/fck/file/rulatudejuxinew.pdf
    • http://agisma.ru/files/pages/files/vitejibilas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ante+latin+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 16792 bytes
font_01_sfnt_off00010b9f.bin
cb2e170930a6052c206535d0dcd23d97105973b07dddc95ba591642cb3ae0460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 24152 bytes
font_02_sfnt_off0001489f.bin
d933e0cd19bf58170f9f50d913519329b4a6f7447084c79afdc230b20a0a7679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1489F 16404 bytes
font_03_sfnt_off00015f4c.bin
fcb9a36f658131675d1929fce9fc6c0484964c58cdd40e213449aaa16da41865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4C 10044 bytes

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