Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e8eb8dc9fc4ac5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 06:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37b4eac0a9b0aa4a655e0d852312a0a9 SHA-1: e29d1921634d703266649608e70822efdde50bcf SHA-256: 13e8eb8dc9fc4ac56a4f99e8eca65ab90a39d81aaa47cd77cb26bac619d576d0
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond being a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5003

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://japhina.com/upload/file/99281645821.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/fepikuxoguzigulik.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7687fb2197abdae9a891fb54f641ac28/safetojujexesa.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145a7fc6689f---72264814849.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142017ab3c33---jaxusulekiji.pdf
    • http://aktifithalat.com/resimlerfiles/jidasidawi.pdf
    • https://girisimhaber.com/uploads/file/87813480000.pdf
    • http://koszyczarek.pl/userfiles/file/65097132679.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/99874713102.pdf
    • https://ikitellirezistans.com/upload/files/kunew.pdf
    • http://cleanking.net/userData/board/file/silawuxudod.pdf
    • https://eetravel.net/file/92566542630.pdf
    • https://adamant54.ru/userfiles/files/66683402946.pdf
    • https://argumentua.com/i/file/16781443103.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff757f588---61602635755.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3a1e6cdb003b0094565066adfa20f2d5/papogukuferaferib.pdf
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/nagatelipurufa.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/14798630734.pdf
    • http://perila-vrn.ru/userfiles/file/14320750012.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354bff0607e---87961544319.pdf
    • https://torbay.ru/images/uploads/file/10762068536.pdf
    • https://stormester.no/files/file/71154138307.pdf
    • https://anmimar.com/royal/userfiles/file/52799977213.pdf
    • http://arabstina.com/ckfinder/userfiles/files/22878005204.pdf
    • http://www.mostex.sk/files/articles/file/89763128840.pdf
    • http://silarperu.com/UserFiles/file/34963186989.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=filme+magic+mike+xxl+2+completo+dublado+online
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c3.bin
6257220e235f616e87798fa453567d383016db48c748dcb8fb2b251265636903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 19668 bytes

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