Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e031d36b2c3b8c…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 10:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 952c7fe73aa9993a4de43aa8051f921d SHA-1: 395d2ee098a6b2d6f2b01518bfcec3fa03d28cb7 SHA-256: f3e031d36b2c3b8cfed74aed423ef54bb48fecd9ee49a003a2345247baee1395
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12fff85c9e---14761303104.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6aa8bb79ae924e0651f42438ffa61f56/bozezazogo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d7fb4f14bca175f6d86d3c08cca33e94/98402431083.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ndph11j6n1uk5276g70o4437e6/bedogipepapotetapawuw.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607de21ad50a5---kugapamigidexanajoz.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ldlf4vge62koq7timnjo1addg/kagafur.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/bexigibet.pdfIn PDF document text
    • http://ledins.lv/cms/file/sezidivaralinaber.pdfIn PDF document text
    • http://intergeored.com/upload/File/mesokota.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/luzolusepimidufi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a482d5dddd4---woxonejelijidifili.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0009c23c99e10265fa4d89d891a18b50/wufigigelusegur.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/65871076619.pdfIn PDF document text
    • https://peterdegendt.be/file/50333422793.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/kawamasoraxowipumu.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/mazewi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55d0c5846---jevupilukukajafigonibekaz.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0c1ad3fc0e13a0ba9a1e02a2f0f7ccc1/mazedesud.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m7l25sha88rdr2krvuncco9sau/35394493865.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e9e542f6b85534e851da147dc6c86879/58925509052.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb7467a572---jiwegatad.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/52365478245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+protein+structure+by+carl+branden+and+john+tooze+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 17760 bytes
SHA-256: 6f966d996849d08cbc8f864a404928708ded9462949b67701fa2c0dda2bd0be3
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 11296 bytes
SHA-256: b789def8ce2d754f449cbff1545933b995ee5735da7bb5d0aa334de728fd20e5
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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