Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8579a0c65107b5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-04 00:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b8fe21488c2e473b668545031bab9b3 SHA-1: 599a943315982bbb0a2b16a8d0d0b0b699917fc0 SHA-256: 0d8579a0c65107b5a403cc574a7160d114f52fb35de83ddc618c98bc57d49806
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6569

Heuristics 5

  • 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
  • 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 http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/44268333815.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef828eac78---39249044034.pdfIn PDF document text
    • http://fournitures-reliure.com/prod_files/wawaginoz.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/jedugusadu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba9ac34da---fefenezasixuvalazub.pdfIn PDF document text
    • https://manenshop.com/upload/files/sudofe.pdfIn PDF document text
    • http://signauction.net/userfiles/file/murotomugapirutomivekijas.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90696e900---87624524298.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/muwonikal.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210722232923754.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89336309248.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ac2f27712ab07a9aabb514b5e3031edb/85631083436.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f9bcac46f---nojaja.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0683e2c123a05fae87091efe32557b35/mubodetowerexarixojag.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/nufuvalas.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/48394617861.pdfIn PDF document text
    • http://vocembalo.ch/userfiles/file/35978749068.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab36cd7aac---lejozezalawela.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/kanogubafod.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ff5c600793e2e0560ced46062da705b1/zuroserinu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608640f2674c9---59876798814.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2c15afc34ce73d7f7e1ad115a43627da/pujulex.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/159c227fc3b6eb65a866d2a0ae1e9e36/11190880531.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160949cb458782---47340940804.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb286ab187---38446179009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reversing+secrets+of+reverse+engineering+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 18572 bytes
SHA-256: 53a2e552a1c9a9d152b8ede9310134a21b8ae8bfbcadc4e58ede85f0747e343c