Malicious PDF — malware analysis report

Static analysis result for SHA-256 285cbf54e28f44a7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fb9ed9a29048b013f5bfd2f116f3f39 SHA-1: 81bd80c6d53729a1bfb5c00f0e40b9af31d76d36 SHA-256: 285cbf54e28f44a7dd590c1b0eb210996f7f0dbe5669bb8f812fc5626df5ba55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

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://profix.fr/ckfinder/userfiles/files/kokate.pdf In PDF document text
    • http://geometracosentino.com/userfiles/files/26136520301.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/9370804389.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c3c7dac9---8632139450.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/domubuvewijaxuwasodedeteb.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dosexaxawufima.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8935ada2a1e9e330aa9cb90b255d9661/jixeka.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949707acc7---52344438231.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/2t95tcks3u551hotviv07tesc7/relurevefunu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/i69sapum730lt7qkp8kirbqkm1/viwaf.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/sowabukisoxenubukejumokik.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/lupeto.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/nulekotabewe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cda3696ee5d577be2d51fd11eb96834a/26447958073.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64ee7b6651---xazenisopivu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5849fcabe01e7b15358248c093b4649/tirewuvutufoxizupekaloliz.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kenilufeninazotaxuxexamed.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/141e32c982299f31733538563483b223/rikonas.pdfIn PDF document text
    • http://soles2walk.cz/data/file/42223240456.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/29790621406.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/95c2f5443e5fb6972dec493df174d64c/ruzumebiz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oaaquucbv94klvpciraruvdnq8/wapusezudus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=learn+japanese+for+dummies+pdfPDF link annotation
    • 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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 10704 bytes
SHA-256: e069c338edba1ed93dfb53a2eac4f196b9692995ddee1c99a9317cc83e5bd1d5
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 19988 bytes
SHA-256: 397c4f54c52470c580a21efb375a54ba785f83fca44041ffd27c062d89fa518b