Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a50d9655f3c8ee…

MALICIOUS

PDF

86.6 KB Created: 2021-07-24 13:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f04ffad65cda5899927f2c1049890af SHA-1: 2b71d2c424a7c3470ef47735aa03213c29a147d5 SHA-256: 80a50d9655f3c8ee8177bdc56f6d171c3324418984c625dd1b6736108e6988d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm intended to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852fc376461---73540553072.pdf In PDF document text
    • http://tcihk.com/userfiles/munuzomotilolazab.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/bidobukufixoged.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c110efd26---midazesa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fdbb56e6f---78379543776.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/mamivagugokevovevawukuv.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/robulovif.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/tuwasivazij.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3ed61f96---dazoguvewopidolekizuke.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/jovomusofu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e6c514ea---86143318914.pdfIn PDF document text
    • http://gute-reise.ru/i/files/files/semidekepiwafiwutito.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/88a62d5cce369bd1c5b8e544c7805830/lijerula.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/61560351058.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zawiwowovonuwiz.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lanolabotavop.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/riwebufivibutalo.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/12878587549.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/55858748413.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6024e419---nakajuwujaroximi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/40aac7b24aa0f7a29292d0ab2007f9c0/77484867257.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/34363063250.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c88acd504c1a723edb7075592232f8c3/diduzeduvaxajifev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=.dwg+file+viewer+free+download+for+macPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10672 bytes
SHA-256: efe1c61cc3e43477c6cfb45e5f24c32e0c44b90fe980414c8d29330f47acc334
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 18324 bytes
SHA-256: 7d4b9976769d5d03543f0c6675dfc9d3323e8eea406688272830bbe697ad3d08