Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9927493b727c05b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 10:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8951945803b2dd362f413e1ff5836519 SHA-1: c9c3ac5ffbf2e094f7e5e23365a8f265c9b80cb0 SHA-256: e9927493b727c05b6b32b874df0c159ccff3a4b6c96a810ad09fa65322169a44
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of `utm_term` parameters in some URLs further supports the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7325

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
  • 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://chcial.ru/uplcv?utm_term=shortcut+master+lite+apk+download PDF link annotation
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/63651691898.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/sonisobekupenov.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-09/064c0fd39846bd9a21075101ceec9f24.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/reratawasuvodivugavu.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/47026315332.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/sudojavabavem.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/foxufezawupitaxi.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/mipaf.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/11252670444.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/3582684793.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b02f8b3ada---21215192290.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/9980871598.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/28989990281.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/37703155918.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gri5374a7ac5ofhp88f84ntop2/3535708922.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fa9qeddhgt8qol66fnavrpd1i1/24320187734.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/sovozapirakakinakage.pdfIn PDF document text
    • http://jljemc.com/upload/files/mabuto.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/bilofazov.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdde938bf---28550546452.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/28940317058.pdfIn 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 18620 bytes
SHA-256: 81f5950b80b725438fba1e94e7c1429c63ab5fa9904a517ad60f6268eaa9b642
font_01_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 11132 bytes
SHA-256: 0223a0d67b7d27eade3b67d166e5e50408e8c12ded5ed44740e442b9aa423b5e

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