Malicious PDF — malware analysis report

Static analysis result for SHA-256 171ba8f75d42e379…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 11:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bfd70fc7dc8d39fa984f82f8074149c SHA-1: 191243e366dc1a12417d9b863cdea374bee934ef SHA-256: 171ba8f75d42e37901cdc82c4e74362ff59ae59680406e749a076f9807071fdb
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of external URI heuristics and link farm indicators strongly points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://pixomot.ru/uplcv?utm_term=watch+the+walking+dead+season+8+free PDF link annotation
    • http://inhome360.ru/admin/ckfinder/userfiles/files/ritenavogidilesalamu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lanuda.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329b8a0c38c---rivejo.pdfIn PDF document text
    • http://cochemical.com/upload/files/vojikoteke.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/muzovotopumagifikudikarig.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xexasuburulogefolumoforov.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/zapejafagivalegotabugos.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/monamojon.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613492b6582d8---51269118591.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/binusewofodobusazosida.pdfIn PDF document text
    • http://kvrhousing.com/uploads/29882291059.pdfIn PDF document text
    • https://thehouseproduction.net/file/90473777448.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vutekudozukuzi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e398f239---pexodazafasosivarobezezib.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/m0frm7ns4i671pkqo3kfag27ai/46093993921.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vegadujijisalol.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/fajafapukeku.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/25830094861.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/24421550360.pdfIn PDF document text
    • http://jawarakreasi.com/file/voluforebaboxu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/229b997913dbbacd1106f61f50a6174e/49986798132.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/volimon.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fadezelezi.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/meniwuvajadubavedikuviged.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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 11136 bytes
SHA-256: 3f5b7fe964d5ddc91b4e41be66d673e54e51c873cb5c25c5330877fe3885a3cb