Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af647c2b55e953d…

MALICIOUS

PDF

85.9 KB Created: 2021-08-27 06:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e76cf7366f1933b482c6944695b59c53 SHA-1: 85da66bce154d00ebb62279e8dd4307ecdd59bdb SHA-256: 5af647c2b55e953d4351a0c5def39d41bb60d4fb19f70424f2e07a901d39b9d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the heuristic firings related to link farms and compromised CMS uploads are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9710

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 https://huntic.ru/uplcv?utm_term=differential+diagnosis+of+nephritic+syndrome PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b6a6f607457fc2916bef23226ec98d8f/dipexumubozitiwaveworag.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e5720da22d1a9bc1b85b74d17ea098a3/97654648164.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/35216183429.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/mogivesijusizev.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/zijakadojosikivagetepo.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/44133108864.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rerenekopi.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/11381883495.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d853f50dfc---24749728832.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/xuxiw.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vt4o1k9kmamres38dsvovnokf4/47835994184.pdfIn PDF document text
    • https://emmaushuis.org/pages/zibesewoli.pdfIn PDF document text
    • https://dm288.com/slicice/file/vufejoza.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5b20682d450b54258d8a7507e47f442d/83327089491.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/862d1d307a4f4a6d381f91b7915c0590/zidotisegozi.pdfIn PDF document text
    • http://wirheiraten.de/images/file/pafita.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/761kms2qjeuh640aocq24s86c3/64324551680.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/26563268274.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cd0dd08e968eebccf46a9b2955592652/gusimumibojumegaxagiw.pdfIn PDF document text
    • http://fitviewer.info/files/file/fiwetimupoxotoxiguw.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/70556752720.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_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 11184 bytes
SHA-256: 78ffc849b95f158de15c86dc2088429da3c4432f81ba2c975adeb8f3375dd114
font_02_sfnt_off00012ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDC 16716 bytes
SHA-256: df95de045cd991e161a46c7dc6f807a55ef55185ad2c8b9c14e56fc86fba7eb2

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