Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcb9fd4723d099c…

MALICIOUS

PDF

96.2 KB Created: 2021-07-25 03:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c5f38655caeaeb5c7ab68cc3a9aedda SHA-1: d690c17d62105248dfb3818f8f75ff801b28398e SHA-256: 7fcb9fd4723d099ce0e5b914a6d3656df1b49881f73c97f87735378368835fe3
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document instructs users to open a password-protected archive, a common tactic to bypass gateway scanning. Numerous embedded URLs point to compromised WordPress sites and other disposable hosting, likely serving as download locations for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/13800045e57d7acbf9523a327497afa9/gojodujebera.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160787ef1194d0---77362981475.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a6ba552c---38995838527.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/36223392776.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01eed72f59---degatekexewigixo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/6551291537.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ba9d89b7---zivepamutuwuvuti.pdfIn PDF document text
    • http://goref.ru/files/file/88508392616.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c8158a46---taketema.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/40311692560.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/b0omvc7m04qui5c5dao5l4ngm8/vuridazikuwituwaledulufo.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/migobela.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ktsn28f70m4eegal3g5f1qrus1/dureximojopedotanagij.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/30273076087.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/tebemot.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/zokedefolavurozi.pdfIn PDF document text
    • http://dnepropress.net/files/file/38053285061.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/41331694706.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972ded2fa4---93218774664.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/93463697755.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/petafizikinewivivap.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082325893fd6---rijiweferogofunuge.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/46495954682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=baixar+lista+de+verbos+irregulares+em+ingles+pdfPDF 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_off00010fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 18596 bytes
SHA-256: 730b1a9b154ee9ac4686a0d874b6ef98accd1956ba6cef0ceeaf2a013edad8a0
font_01_sfnt_off00013ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 11300 bytes
SHA-256: 4cb49b3f5e089164d56df1ca06277dc355e1eb0a26ae51cba36036c32b49c0ad
font_02_sfnt_off00015809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1