Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d488c4449b339e7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 20:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 485bf3f8756b98378dc9bb5bce5a3da4 SHA-1: 2ca1a4f422bad40801129312c06e0495add1ffba SHA-256: 5d488c4449b339e72fb0086b63c8c146b0e34cdee01d1ef9707b291044786103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=free+mp4+to+wav+converter PDF link annotation
    • https://mbzgogo.xyz/web/img/podborky/files/30847719584.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/25044714691.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/86611237274.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/78452006537.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/90517980421.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a7473df49f5f5ceb58fe4985bbdabc3f/39999664273.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zuwugemojunoxepelupa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135d6cfda4c9---75024574828.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327462e5e14---23880685235.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/zivasawekazubopexexe.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/15714243717.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bobosodozo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391e6edd541---tunususawumoxi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/sopokaverawevijetujazazok.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/maxukemebagininulepagas.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/fogokirijobof.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/dthrv3f6ibk91u5sc6knvjdftr/bizol.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/nugatoxopugesopug.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/49295871749.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/lasusotem.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/topajejipuperonak.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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 17528 bytes
SHA-256: aa0474a5d04323046fec939ae0c5aafded454d0789cf5cb22a22746c90e1fd68
font_01_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 10436 bytes
SHA-256: 8527b9cf3a107c15602e28a9222f48ff8e534361deb598f12bca31ccd77a89b2
font_02_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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