Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8be13d03dab0c0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 07:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efa1594acea55ac2b6ee8e6bb037acc2 SHA-1: 002af8c6bfefa82db6c9b475e2bf7b2e65aedde7 SHA-256: 1e8be13d03dab0c026e7b9bdf94c69949d0dccd0d9fbf37cd74891f81bad7a97
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

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 https://tortugafilms.ca/adminfiles/file/72827015192.pdf In PDF document text
    • http://goldengatetaichiqigong.com/userfiles/file/22178644863.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/sobagowuridaledodubavoxu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea601b093---66634235728.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d2be00a62a9290301ac65b9aa8f35cb3/85708879309.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/muvonobaf.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/musolar.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/duzideriganolavugev.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/soluzadududav.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f23f36390---33964844974.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05748467d---46951768428.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/91228122314.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5f3ccb35dce8a57c106e8eaaf550994e/68522639656.pdfIn PDF document text
    • https://mattress-leader.com/media/89065385666.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/gizomovekefo.pdfIn PDF document text
    • https://ovalpolycoats.com/media/rozurutokap.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/muxudivegot.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/zujij.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/73548525451.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b8ae18c66---duroguguvenoguwani.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/dajovasaral.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f16528beb55631bcb361d1b601e1a953/40703766385.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdi8q2onm3nfoa09s59ucl1d0o/xunabepewodufosudoxof.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759d1669121---28634244225.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/80081297276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ariston+washer+dryer+manual+arwdf129PDF 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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 18096 bytes
SHA-256: 0c9ef855e028d53eff742fcc5cabc44500489e14152adcce19c16e5367b7b31e
font_02_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 11240 bytes
SHA-256: 7918117839fcc4095efffb895d17b2a17a67a325cd07b10b368c20e63ccdf130