Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd3db8969eea431…

MALICIOUS

PDF

75.0 KB Created: 2021-06-27 23:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a25c8682a9f8b72194f821a2d4d4d0a2 SHA-1: ea590685237f3cb8c77447bcb84eea9d30366cf8 SHA-256: fcd3db8969eea431e0bd83c3448dd2e8a8a6d67c7973288ac3cc7af1893f3b25
156 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 embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly indicate a malicious intent through its URL distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ats-dz.com/userfiles/file/kanaf.pdf In PDF document text
    • http://haphadoor.com/upload/files/sawozileludu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d5168a8a97eaa14c941e3cccbbce1a87/zifedorapuxajeb.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/surodejopiwo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/64766556427.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbaaa98e3---bopikigoduborape.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b75cd9053---77460530567.pdfIn PDF document text
    • http://abwva.com/uploads/files/72221260202.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/os4i8c7sac34421o9e49l30289/nanedapanujar.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/40650512874.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01a922187---zezonuk.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081230c79c87---nasoxilegunotoj.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/34704836515.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/414fee96367abad2b75dc24f281c3f04/derofezusux.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lefewozudowitiwaboxogileb.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/20174091449.pdfIn PDF document text
    • http://93564497.com/userfiles/ripasebazekikitale.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a4dedc2aec601ee7d3682606069ace1/wisofixoru.pdfIn PDF document text
    • http://rld-carbon.ru/file/97993526518.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c6m3fu4j3riudv0ktaiufub4g6/rewupitoriniviwezodi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jesarafufagibab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=worksheet+for+square+rootPDF 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_off0000c363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 16988 bytes
SHA-256: 6d2275bffd41cc508bebdd5d7f2b6d1741d318778a9ddf4712444945890630cf
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10400 bytes
SHA-256: 9cf4f620337e30f875653b91f4a3cbb7958f3b81084f9637192cb6d8bff6fea9

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