Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc9bc9c48ffa5e7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 14:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ffb10f99252607e266aa10db23e5af54 SHA-1: 7518017236e49d9223092bc32a0ac602f112b1bf SHA-256: 0cc9bc9c48ffa5e7cb5b7b083a1d97d805fd35b333198647faca5bdaf87a2ede
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, the document functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6374

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://demircanticaret.com/userfiles/file/34639332037.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/87222249356.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210921_2E887DD0D475F7DB.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/doxupaveduduz.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871a48a58---titalagosi.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/74808393567.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/48647642326.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/68605792588.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/vibafasosexexovibesomal.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/teravijovemarukimurujos.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/70140222171.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xukuki.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/99933110345.pdfIn PDF document text
    • https://brs.jo/userfiles/files/nunanigujaludejemazogaves.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/juzodareruzuwejovuwojo.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/nurumutesepewajedugo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/76852780705.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zumopegigiduvawesidimi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145a165734eb---vosumogepim.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/wujirejezidegisawexodo.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/7267817947.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xirozidelosalam.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/jesuxaman.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f550e82a55d666e3d873ae4a1abb7a19/turukezezivurunevi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/aaf40b06a31c2b05f570bd7e90193865/vemazis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+diamond+pearl+emulatorPDF link annotation
    • 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_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 10580 bytes
SHA-256: aa30f2b4629580328382a98a91a0744ebb346e549fa6fa1fa0e5d1040ab2dfec
font_02_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 15408 bytes
SHA-256: b6ee41b48d122ce5fa1ba96943d36d17fb7c38f9d55de76a692ffaef3300b4f4