Malicious PDF — malware analysis report

Static analysis result for SHA-256 a876de3d93ace2a9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 07:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed1fe352a435bd2afb7b2928dad2d158 SHA-1: d090d1ba652c5925443815099d138e98553e96b3 SHA-256: a876de3d93ace2a92881ca998a23b521ca5914aaa75349a4f5d2931965b6f468
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and other PDF files, likely for SEO poisoning or to lure users to malicious content. The presence of multiple links on potentially compromised CMS upload storage further supports this. No scripts were extracted from this sample.

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f290463340ab0d74b19e3d82bbba7081/bupabesixomomomanibi.pdf In PDF document text
    • https://transport-vehicules.fr/userfiles/file/81685143102.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3dc2bdf91532f5dc9aa590c6d5160303/36869732690.pdfIn PDF document text
    • http://spakimthi.com/upload/files/52337650189.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d7c4c4945383cfc39d6512034a980333/dupifimiruwa.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/geguvisakuwemiruza.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/5788776751.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/pudpdb532kv6vuopc0hgmheqh9/34254343377.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/794af719ab9f1390a5e2f77c8746d99d/tumiwizititesosef.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092896d1243f---dimutobovonori.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a273b1c5d---sejorerotob.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/87764587808.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/bowusokowesimas.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/98273492799.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/6904422511.pdfIn PDF document text
    • http://northcity.rs/slike/files/vizis.pdfIn PDF document text
    • http://billsky.ee/files/file/jumun.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469df18163---vilufazi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61212035477.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0ntjq75lu4lk9b96eej787a9bs/degefefugopuwotumip.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/loroje.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/16907006369.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/l9q8ur1pccejlo13k0k8hh2sg2/dadijuwosipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fairy+tales+in+urdu+pdfPDF 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_off0000c097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 17804 bytes
SHA-256: ce9c6242afee58010e399af6b47652c0bedf5342579ee5e78fc09956cb0259f6
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10564 bytes
SHA-256: af062e0e3c6070513f3342593863f95d8e1faf299713f624bb40c3a15f3a9360

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