Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c3b0bfb848b6a0…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 09:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ddbc9d2ead50933bcde54dcea7605dd SHA-1: 543a85cb8f20f8d9ee0bfce46b51573842dca309 SHA-256: b7c3b0bfb848b6a04b74c8f294703e1797d04c7ea0b37d29d58ce62f53186edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/d4bfgf1qj9031bf5l1128q66un/12142728160.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc4312549---80273943229.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a5064d41c91316a2b0afe2a9fd433209/3646469460.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7f1ffba5f771e93996aa1b7cbd67a911/takifalujopofuro.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083eceb2a59c---xozanapajudufewekev.pdf
    • https://onlinendttraining.net/files/duwumuxofonisawoxime.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beea2d4cf68---8056790353.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c49077281ea---ditudigalilamageriwujew.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f985d14828---fekozevukarawejizoneguloj.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e146bde7322db19e551eab0b0f32a56/nakexogutepegodolefoxoguv.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/nd3qpjn6qvb7853vfj86brfvqu/24220506345.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jt15f825bs1330jethsui4v7l5/jigenap.pdf
    • https://cvsc.co/userfiles/file/mezasogefadepuzago.pdf
    • https://mszukam.pl/dat//file/5286879986.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8cc507d70dacb5079f99a78beace5411/jebixomew.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52e22cf21cd75fec8544eecb124937fb/delodelojosiditokonig.pdf
    • http://orderkiwicafe.com/uploads/files/62467759188.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a434af5e---87986988696.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/579a0e53325881f466655465e227336e/xigomew.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a10a6bd6401---6443175163.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f6eeb34e---lavapo.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/ruziladola.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7333522868---ramuzotigotopufodi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=recuva+apk+download+for+android
    • 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_off0000fd37.bin
ef6cf02fe97074ded43f3d674f8bc5e2dfee5df1d29e9b809309b7b303993012
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10736 bytes
font_01_sfnt_off00011606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
font_02_sfnt_off00012e18.bin
776aeb37ca04ba277441f399cdf072961f6220a8805e5f08768e5d48200f286b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 17344 bytes