Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5132e8496ed3334…

MALICIOUS

PDF

102.5 KB Created: 2021-07-30 20:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb436d0a7c6b275108b6c5760e2627e0 SHA-1: bf5ef9d94b56551f968588c01de3cf49ea62bd15 SHA-256: c5132e8496ed33349d19f4d35c58e6a10afa5ae6ff3d10079bef507010de1815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites. The primary URL suggests a lure for downloading content, likely a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=download+film+percy+jackson+3+full+movie+sub+indo PDF link annotation
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/noxifumomorinozezetufom.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/37609b9647adeae15a6136bff366e64e/21130508556.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/93679541633.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/figadefojojavinuvud.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4526b072a1997693145acc00dbe82426/85801834875.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd1494945b---12383393622.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210610085049.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7b03441bbd8650a5a800c21a7747da1/31045930352.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c665a03693---fajinigojuvoxalobu.pdfIn PDF document text
    • http://berbun.com/user_img/file/99813103492.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/70460507849.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8ab62bbcbdab7102542dd6107afd7c4b/95183856713.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/benefokarutuge.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45a8235ce---49082350972.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/09aee265eb7e452c21eb8c41a920eeb6/94178655773.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nesapomut.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/lekiz.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1m1rpodo4gqrnmqi9ln0oirch3/80015460690.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0n8ldku15m6m14ljhb8fo666ur/93460169841.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/sasumibaz.pdfIn PDF document text
    • http://geodez.com/pliki/file/gujibogogoted.pdfIn PDF document text
    • 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_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 18100 bytes
SHA-256: bb6acef998e2729bf79bc0b825ceba6929ca6bcb4745cd7a226146ef0fa42727
font_01_sfnt_off00015931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15931 11584 bytes
SHA-256: 537a0d3caa4096f6c30c230b78828a2b3e6a2573090634d9c36f263405de7988
font_02_sfnt_off0001747d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1747D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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