Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f0b02aa0e87747…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 10:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a910d357ddf720ac56fe60f9098e7278 SHA-1: 9770b9183f5f706ce7663581ef65c0a254f7e176 SHA-256: f4f0b02aa0e877474c5a6693dc0296f7ec7b0b244ec05afa11816dfa9b292a13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=effortless+spoken+english+pdf PDF link annotation
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4fe4e7ba---doxidaxatifoduligesopeb.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0161e10a31---vejilebijonelozaripokuda.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7f6p7ai0po5hpc43gptefhi8md/dowipebikud.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/2011443239.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vutedogenumakugojoded.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/didebewiwumumij.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fb38af17---nuzoxopitabekedotenubozi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/96226246897.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pcsvf58ggivlv71t3p4i0mbume/68556659419.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8f9cec77093d908502b95ee608305cee/jorer.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/parululemifeleruz.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd66678b01---58999489438.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h4dcrmvnbq8fv5550oke0ou5i1/54553367402.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/78575981049.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bubabesinipifasidilokuk.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vepezoxu.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/665a0b3b22a499624472ded74b88b75e/22252572684.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/14933339336135ba10a34e2.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e72d5f78151393211cf8baeb678830e6/pomedeginosagibolim.pdfIn PDF document text
    • http://myphamasia.net/upload/files/58680342015.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/18429564662.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609486b40bbd2---goruwulupojisimi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/83085214714.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 17744 bytes
SHA-256: ccb1fd58355d9dd6239363bdbcb731bb52b669833747ee3021feeabf5ebd0d39
font_01_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10688 bytes
SHA-256: 13f08f7a18e7ec53eaa078f9b1d3624700ee8caa3389e2609857e02dd336d7b9

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