Malicious PDF — malware analysis report

Static analysis result for SHA-256 709e97773e2c3719…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 23:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b852469c8c89638b8488f8b3e27f272d SHA-1: 528e67754253d7fb5cafddf60924ce8e837d9309 SHA-256: 709e97773e2c3719db21480b720f2361469cc776978f38d9377a7c1e6fe3860a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/opei4a1cqtmdeqi135v9v770sk/40146767776.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e35971a1e---52286102575.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/9374538089.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/584s0rmujnvac9en8on9957np7/dedozokuwunopegete.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/o52i6iqi17nuk3aq0ld6a5q65r/virebofi.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/r4t3qb8hf72s3nh7hne7pisot5/gevukokokijamixupi.pdf
    • http://alnadaoil.com/userfiles/file/71149864856.pdf
    • http://andrelandberg.com/userfiles/file/55623563120.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22a229376---vavon.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb5b0828b---savovujewajede.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/524b3749fc41f054808a6fdf9fe6e991/23206803489.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed89759cd3---jogukolog.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080906c98a2e---79946859634.pdf
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/14232020950.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73541653486.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50d223493c---ranujizewadaxewazi.pdf
    • http://hodori247.com/uploads/files/tekuwopozuwewajidi.pdf
    • https://mariellatriolo.it/public/file/juwodetopupoxa.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/radalexamolesinuwokixigop.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e57f854b66c4de6bc15adbadddb2303/89338138309.pdf
    • http://stroisvias.ru/userfiles/file/89327758277.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=use+of+hydrogen+sulfide
    • 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_off0000eb65.bin
7082e80acd26b63771d00c0d8512256316e3e07218a4d629d21091e9c121ab66
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 17896 bytes
font_01_sfnt_off00011a86.bin
0475bb29b2c0dd745e38b129477a5acb0a5474e16ea38edec2e449285703a1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 10596 bytes
font_02_sfnt_off0001326f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes