Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fcbcdcb5308247…

MALICIOUS

PDF

87.0 KB Created: 2021-07-10 13:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88b71ca2ef1456563e83c129f4d95950 SHA-1: 40877e9ca972f6b0258d845b521212ce3aea37d0 SHA-256: 12fcbcdcb5308247331e6bb64e379698ecc7aae542bf36a86fc8568d8190d857
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The PDF structure itself does not contain readable content, but the associated URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tennis94.fr/img/pics/files/92721094021.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/spg7g1pnpdmmk5d10dou84pnl3/95013410993.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/wipoku.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210618_179FB88D56B42DDD.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a4c655dd---rafolojipodudokenilagexuf.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/jukosovuwagexonulobulaxoj.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210607_1D2DA83496AA4359.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a8981fcde03---70055381194.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf40e0b1a---94330185955.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4b5b7439---986582875.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a039694930d---21878563212.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608044afb1512---42056313336.pdfIn PDF document text
    • http://dzbnf.com/upload/file///88072546036.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/xujax.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc834a9e1ef---81571537467.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/94573487213.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c20f59b41---jikevev.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12d907641---8637218064.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/bunudesobevopexafifowukov.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/86255432527.pdfIn PDF document text
    • http://goref.ru/files/file/52053264323.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee15a772a---55142479236.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bd8a0fea0---wukifagejaniku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=afib+fast+heart+ratePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5eb0393b961a3ff27c8396fbe764a97b/60659744948.pdfIn PDF document text
    • 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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10164 bytes
SHA-256: 4444f97b76030c481d1a5126d9f91cb4e667020a209b103fbe8123fb1ceadeaa
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 16976 bytes
SHA-256: e14c3467d0ca0708145461b1750c0fb6cf5e6c5264c55413805431e7110e0b49
font_02_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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