Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff3d8598304c8db…

MALICIOUS

PDF

94.8 KB Created: 2021-06-25 23:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79db382bafe7f0e804ce1b00f043f216 SHA-1: 9fcdcedaef182fad70d1ea27f1d6a70b7d358fc1 SHA-256: 7ff3d8598304c8db3accd5f1a888182e6a220f395a3593d1c6c6c5fe2f9bba27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a phishing or malware delivery mechanism, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://bebelino.ru/userfiles/file/vojurafexafuno.pdf
    • https://dm288.rs/slicice/file/37039284771.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c95a7500a5303b6d4ae0c0770b2b6085/xazogusetolemopin.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4a2d2ec68cdd2c2f0f56a6fa0fb77cc3/65215891802.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/94271223837.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f0d5f20ad082424007879fbd27e4f30e/42083383416.pdf
    • http://sns.hu/_user/file/jizimesakeje.pdf
    • http://arcomproltd.com/userfiles/file/vuloxopupejefuwojow.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/160f3d71148504b218522b78e1e09d2e/37200446293.pdf
    • http://elturo.ru/img/upload/files/vivirogozufazinabadidoxal.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/brr1eqgbcdp1hga6ct37p0v1dl/majaxerolivepupusizu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rpnldo72c01ln32ob4mp1i1dk0/57895049858.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608444d794570---mulifiweximokonotozum.pdf
    • http://nappsa.org/userfiles/file/58858264535.pdf
    • http://orhs89reunion.com/clients/77823/File/98947108469.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9b6e2332a35603296842ead6131b784c/wezik.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2a3bea70a5a486798e3a62fdd55844fd/94501597999.pdf
    • https://rocksoliddesigns.biz/userfiles/file/67883480744.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e44c35652---fikarewemaz.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608752c56f7db---33235120092.pdf
    • https://gelblighting.com/userfiles/files/tapexefonowatow.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac739e14671---51082140068.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d745n8pqlc8o5vrvogsl056147/zizatateravugi.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0ceb1359317cc2c79b2966214d65498/76917446272.pdf
    • http://chinajnbt.com/images/upload/File/tatanaz.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/099c57c9982aa7e2c172b151a011965e/62132151197.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=life+and+works+of+rizal+module+pdf+free+download
    • 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_off00010d6f.bin
cf2a02fac6fef12834fdcd7a8942a49a44b1a38aee24ce88cf22c6a3d30367d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 17496 bytes
font_01_sfnt_off00013a26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 16792 bytes
font_02_sfnt_off0001523d.bin
d90ac842db06e7f9bf5b42057a7dd106c679ffb533f429230d3014422c74e5cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1523D 10856 bytes