Malicious PDF — malware analysis report

Static analysis result for SHA-256 b231af40b7a7e690…

MALICIOUS

PDF

105.5 KB Created: 2021-06-28 06:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 977aebdd26fe110d3ffba86768709b67 SHA-1: 56ff514f45f551d34dc3b000351c73d29cbdda17 SHA-256: b231af40b7a7e690c727c5abcea8e5b76b9ff2e60767b6bebe23579a15418d47
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d94ba4480---51529732716.pdf In PDF document text
    • http://bjbtrh.com/files/pic/file/vixuvaradobuboviluzetuk.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289893f241---judovipozejureva.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jejoxaxugiwa.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/93082295824.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mubow.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/75820906648.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609efddee2ba4---4538419732.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/45177451503.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/22bc472n11paoi1lumcqnmvu94/40215637558.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcb830a29---17631566276.pdfIn PDF document text
    • http://panteres.com/files/files/64516582922.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/57698d363eea7e3332a00b62f754a9e2/10758860807.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a36f03a95a68b1b77c494e99404f2ac5/97448174053.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dabcbde307---79734253992.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/caakprm3vnjkc5ss7qnupgrmj7/lopaw.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fb4bf7c23cec38692ab16256c3be6cf2/71944997455.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/0c966a1c0db3183ca356e1479495fe31/8021886037.pdfIn PDF document text
    • https://t2sc.me/userfiles/papimufuruvo.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/16352113848.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6989ec01---22734553029.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/ef9ad56917ee8d036b59e57dec9ca3a3/potuzuna.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b396c6d8eb---78929285119.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ackes4hagp8nqmkfc3fcnoi536/xuwesanulekegetototebapex.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/dudokodawigatipukenu.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/vopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=emergency+contraception+weight+limitPDF 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_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 10836 bytes
SHA-256: 4a8b6250cb38a09f48cde76824fa07eb2f6065757ebb1e3116cb755f07a3f2bf
font_01_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B2 18412 bytes
SHA-256: 0bf6b3a5cb6b11870beae772fc92fcda92efbdebb2bc83fbe7b0ab26c715e112