Malicious PDF — malware analysis report

Static analysis result for SHA-256 7062c202ec9509f9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 22:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6fe7480abffecfcdfffe320732ea8db4 SHA-1: 622c2124d653290d462d9f884e2e7a2b37a097b8 SHA-256: 7062c202ec9509f9e5cd54fb0215cb6dc5899943667d3867820201b3b1e1ed9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=open+new+chrome+window+shortcut PDF link annotation
    • http://duet-czluchow.pl/userfiles/file/78517232040.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/kubetozupilekerufanenu.pdfIn PDF document text
    • http://dfanchem.com/upload/files/96085314854.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/nolase.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/jubelepusig.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/80738339623.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0b8b3e09---70440843236.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/doletoj.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/masejupeketuludan.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/siferogamobiwa.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://urduhadith.org/survey/userfiles/files/damexow.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/menejafikaj.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/fa7733a42f712d43d3f4b2346c99739b/72538910914.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/55846935844.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/16503669528.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40610107837.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/76061233867.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091222383473499.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/wowusiguge.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/pazozixofalaregus.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27212130142.pdfIn PDF document text
    • http://cudicio.it/images/file/94306271967.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/pumumodamuxam.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/1025285210.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f499ad94c---wuwesuxera.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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 10780 bytes
SHA-256: 6b0feabe0608fbe52f43e576eece126d6d96734bf2030bcf2d464193554f139e
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 15488 bytes
SHA-256: 41de9ab9e1c15b1c7a238b75d021715eed5f0bc52694ec8253085d92a0953de1

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