Malicious PDF — malware analysis report

Static analysis result for SHA-256 73de050dd1be57d4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 08:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4c5f53a04c4722150e84b63d108effa SHA-1: 5b017b82b887051160f793546125224683269b43 SHA-256: 73de050dd1be57d4ea8ace507ba7af508d07582de24382233cda71ecf6d27726
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/uplcv?utm_term=compensation+in+law PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6e027c84---sibufelikowudi.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/18288231052.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1f16ecc1608c2f4df74cab830442bc64/minubegunepuvonafipovi.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/42265203812.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c945eebc---gafonemeribifavev.pdfIn PDF document text
    • http://ahchala.com/img/file/vefasirasoxax.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/13931024846.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/35132269114.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/wuwilebixu.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/tipotimotodezexotogusi.pdfIn PDF document text
    • https://actorconseil.com/files/file/vafasevepiloteselusup.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/fuwemuranuxajifatonas.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/porovokixowugidexi.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de3d1d818c---towuvoduda.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/30140352054.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/sedudufelavifuzabemeza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb8d1b6fc---44562794272.pdfIn PDF document text
    • http://halaljones.com/uploads/files/fenifabanopox.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lmlgncu8lvvtv0km37lg5bl40/damatekupeje.pdfIn PDF document text
    • http://3asoft.vn/img/files/92268702302.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/jometirozerimigegiku.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3ab14d5cd---delufe.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tthmov7jhbaai2ik416khc189u/dofarokowuniteponedi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 17744 bytes
SHA-256: 5d9c2e0a882155ca990385a1a1d5867d97ac1033e857026012f37872a4c2a943
font_01_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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