Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38fd3f913fc6f36…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 03:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68b8450b39f0d850796625c2ec75bdf4 SHA-1: f5fda5b64c0355b51bff5d87881f0f72195dbd7a SHA-256: b38fd3f913fc6f363cc17cc59b54310c7ca381488f5f596c6437837aa713ddf4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5af0ca61e53e88736259323c42f988ea/ruwujiminojis.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ac0c4608---72907957461.pdf
    • https://classconnbio.com/img-jacson/files/gevewufosa.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b276c2ce68552acd11b552819fab5293/86762101644.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5c88c40a78dd5a0e04751dfbc6921bac/12939631168.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/a8d58d588ddfce842048b68e874ae9d2/44374482458.pdf
    • http://sahrugs.com/userfiles/file/jijegubujeba.pdf
    • http://noahsmarinesurveyors.ca/userfiles/file/71977108897.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca410e64185---13401404324.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/zunexuxejat.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/da7d8fef3d4351e1f9a13743a85e1970/41089052328.pdf
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/tikamemujob.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/dacb4a964bf0aeb42092078d91cfebdc/68190697255.pdf
    • http://gps-tw.com/CKEdit/upload/files/zubofepolibapisukek.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee51e0ef5e---bivupo.pdf
    • https://golf-tout-terrain.com/publish/page/file/bufufu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc1730323---tefuxemigoziletukif.pdf
    • http://skupka23.ru/upload/m/64056767437.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b545235b---rabupekepegisejiri.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e005e749---gamumimizutosixapirumejuf.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eda8e53---89425900921.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a2ec5a12848566c30a91579579e8989/48179632435.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e348a736d---11881668857.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=in+the+day+bleeds+into+night+falls
    • 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_off0000f16b.bin
bc3f71e76e00e3ef72ec316c93d15a732f534e417cf3f687e5861a84a45d1ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 18868 bytes
font_01_sfnt_off000121ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16792 bytes
font_02_sfnt_off000139db.bin
11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139DB 16228 bytes
font_03_sfnt_off00014fc3.bin
c5c8e9e468be75fce56bd92482a5d4e117e873401a955ba272380a2c1853268b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC3 10736 bytes

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