Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5630e3d9b7ca38…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 23:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0be58fc442558f624f9213d19ba0207 SHA-1: 294314857d391ded42593d33d6eb85aa2e0e7442 SHA-256: 8d5630e3d9b7ca3817b54b09c958bfa555738d567d399b0b72858657207fa534
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 pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for SEO manipulation or to host malicious links. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence the inclusion of T1059.007. The primary attack pattern is likely phishing or malware distribution via these external links, making it a potential Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=iphone+notes+for+android PDF link annotation
    • http://dblbtech.com/userfiles/file/31899647883.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/80222102763.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/56894836527.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/kobujaweberuno.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/01946fc693254afc2f393e1743170037/34093195074.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/20239049215.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/23278284273.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/54077232522.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/palebugufavokogakekiz.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/rorenijeziki.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/nusiged.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/11721539021.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/91419036886.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2m4v8t7jva5ao61t02cqnksjm4/49431054692.pdfIn PDF document text
    • http://surtek.biz/image/files/20150322_184239.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e1c0e64c---wilufotefep.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/91044676999.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab4177222---wuvovexazuvimujigugikuwi.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/11862803686.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/sugelevajivanojutajoni.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nuxoxi.pdfIn PDF document text
    • https://ayurmitra.com/files/file/mupunugoguv.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/68ce54e3e718de5b99d83d9177693fad/74776703330.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/28992541721.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/lefopepizomojozujovimexok.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 17316 bytes
SHA-256: 081c6a4cbce79b95e2e0969aa52f0f9d8c43a6983011ef736b5d1f42ed09fa9a
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 10500 bytes
SHA-256: 33c299af8c243c1fd388c050401518b100f0344b9b77ad866a3fd7761887945b

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