Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f24e879c3ba0d8…

MALICIOUS

PDF

72.8 KB Created: 2021-07-03 00:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 26f914b8b53b104b7d7f58cc0a298e0f SHA-1: b65a36bad3dbd740492db9aeef5259914d662548 SHA-256: a7f24e879c3ba0d8e9a5535c6d31fe5518efdeadb9c94785b3a174054a9a0cf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing sites or further malicious content, indicating a spearphishing attachment attack vector. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47d906d2f---lojomifefodines.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c780d5312b---52215388459.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6eefa8f5d---xemikofujojot.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc042686ff---27507911059.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/nawebeleluniberoregulek.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4fbffc4d826abf0454e7423b677117b6/gizem.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9218517858b7bf06e2e53e8f78041c95/bukapibosirufo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df7e4eacc29---83985951278.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160754a3ae7d65---fujezifipekokamese.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/fiziwugipebazutivuwo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/faxizoki.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0bb6edfa3---taxudusopovaxerem.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b86cb00c533---86787379375.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/dukov.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/posebatutujuvi.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/86233128263.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/7134064236.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/53277061170.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3401f85f---gulerimarafagi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8c3f600f84e7d06be09a48af6f47cdfa/kimiwujekilil.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/jubeto.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b69eeed52db---wapakejo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69424188---1660012703.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33761928701.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e1c69651---wozupozowemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=types+of+parables+in+the+biblePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 16036 bytes
SHA-256: 408e79f508591d6fcf6618edfec03ab5a3ec0b8bdf0c8b88c970e4f872f1f0f5
font_01_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 10672 bytes
SHA-256: f83a463390f29a0a52e4f08b391f8d7276e471ebab952789049374ae809f9622
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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