Malicious PDF — malware analysis report

Static analysis result for SHA-256 736d6b3457662e39…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 13:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9839644ee90c9845faaa4e9f7bee426b SHA-1: 2cc348da088e3b0cf2c6f8b9610cf91282e09467 SHA-256: 736d6b3457662e39c7bf270eb31b1936c8e70a4091bdc0c58ee96ce0831ed6ce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a full-page image designed to conceal clickable links, a common tactic to redirect users to malicious websites. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=the+sims+4+download+free+android PDF link annotation
    • http://clinicaveterinariabilancino.it/userfiles/files/10193888942.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/64316927532.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb748d2cffb3189b135a27fbf3940dae/nozubapori.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/movigarurugizixope.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/19059933177.pdfIn PDF document text
    • https://dyaa.club/uploads/file/75806653872.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912145615.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/movedupofubepiwalalegu.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/63587678883.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/56892378416.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jchis5htql2va0k7j3ct46hrek/14792061357.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/23669516682.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/30713492843.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/56725076973.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/37763902611.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/59391206688.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/birusuforoxewuda.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/50525001615.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/medevomabeg.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/papasetinadozales.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7803766082.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614487ce4c479---libidirosubot.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/10287691807.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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 10648 bytes
SHA-256: fa25d82f45ccd2b88f69b39a33d524fd27519bd096064e6bea555621e1db22bc
font_01_sfnt_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 14260 bytes
SHA-256: b982ca6b0bb53b1cf0c0fa0bc5151f0959e98b6bb714155ca5bf13db49933eb2
font_02_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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