Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1489091f4997f34…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 23:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83fe848ef84402abf32b0ce3c4b2aa9e SHA-1: 375e3d4beadd49a362d7e7d07e0625810b44d200 SHA-256: c1489091f4997f34a1f68b6d623023c3bd3a4cfca48312ee1c1d141b301e3f9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, aligns with a common tactic to obscure clickable elements that likely lead to the URLs listed in the IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 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://philabc.ru/uplcv?utm_term=among+us+mod+android+download PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143291e6550c---pasefu.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/73569352921.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613302528c99d---kazudopokubolojiminowovo.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/nolabagajufugimuz.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/rovebitilaximigugupejigu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/51617892682.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/79634069049.pdfIn PDF document text
    • http://sieuthibds.net/images/files/gikevozomerifavagepulupon.pdfIn PDF document text
    • https://grandegroup.net/files/65144967532.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/4635077210.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/domaga.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/63087987605.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e2bf75ac3560b213e9f6a7fa43b8e6e2/betadase.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/suvewonapobebetupil.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/sogasemagejarifaneture.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/kesojozazur.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/tifiloku.pdfIn PDF document text
    • http://stisk.com/file/90925982096.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/zirobuniwuwuxujen.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/ritezifikuluredugosowe.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mujemivupu.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/10055325192.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_off0000b0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A5 10528 bytes
SHA-256: ef86b15d893f75c286f5cded58b26f8999a11df301dd0dd91b764d3e306b09b0
font_01_sfnt_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 14260 bytes
SHA-256: 8a807e90212d1d6c309950de7d92a91709ec9615eec747912ef892c6becc9dd6
font_02_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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