Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c536aadac7c401…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 18:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e19cb89f2188131f5056575754ff114 SHA-1: 1ff37bca7a863b1e4b39e3bbeee55cd425b532c6 SHA-256: f7c536aadac7c401e73f1c6c89b35db7a34173f4640bb777b3c4990bcd7f3f56
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to numerous PDF files hosted on potentially compromised or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic of instructing users to open password-protected archives, likely to bypass initial security scans. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=cambridge+starters+1+student%27s+book+pdf+download PDF link annotation
    • http://igorodstore.ru/files/userfiles/files/sulufo.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/bojanonikix.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/23647845043.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/56704672080.pdfIn PDF document text
    • http://compsult.net/userfiles/file/dexabikinelexelirataziv.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/5dbd76b9ef8ec72847ceee23edc63f16/5528270417.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/56749273627.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/gabolidegidepexa.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/19516668778.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a04b87798---41926909678.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/pezekiremipazinite.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/jomowa.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nasonijajokerolikorubig.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q9v5vcm2hermpqhd74anm6af4s/jitufadi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0e744762b9b955f3c8e2ace05adfc3db/rujemejekevunesogamube.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ada46a16b68---xazixexamodekalupu.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/jovanasogebixawek.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/zunedisarigegomumopufane.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/tajadetised.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/wotakabukinaxo.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/ropefubobobibuforuwu.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/93040604696.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/popuvoraxugitadolekot.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 11376 bytes
SHA-256: 75bed56b2443bfbe499cb54519394eb8beac4568b0318ed07023daf7c8bcbffb
font_02_sfnt_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 16456 bytes
SHA-256: 70a2110875f78bdf70c73c3a16a931d44d61902c24ac031ef10d1b3b718b3932
font_03_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 17128 bytes
SHA-256: 229e06d4bd2de5862bf485aa2cc1ad9a57280e110cdb7fff8bf2ed269f09cf53

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