Malicious PDF — malware analysis report

Static analysis result for SHA-256 1891332e553b5b9b…

MALICIOUS

PDF

69.0 KB Created: 2021-06-23 11:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86de6b70f2606f47b6ccbee3acf8a488 SHA-1: 5919d6e1ef6aa348280fb7b87113fd0d048d4207 SHA-256: 1891332e553b5b9bc9f54716f53449f06f1f86f0a6507051b83789cbceb813d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document's content, though obfuscated, appears to be a lure related to 'G6pd list of foods to avoid pdf', likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://palcev.ru/userfiles/file/89354871571.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c84e2a46009---6705390681.pdf
    • http://gillsandgeckos.com/userfiles/file/42089453256.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16073d88e3fa88---87160115553.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1078e82c36d6043901e6e43096c9feac/javefe.pdf
    • http://altelaw.com/uploads/image/file/76861105629.pdf
    • https://ludifrance.fr/userfiles/file/lujabumavaxaf.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b150cecdddc---livisokizijibemirif.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/miwerobef.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081551535289---2285282266.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c90056b24081e45a187424d485a7f38e/dawusozodefujifiriwow.pdf
    • http://rgn2u.com/userfiles/files/25163526125.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5433846d6bc5f556c3326ad8e1ad5f4c/48538176619.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/6qe4crrneua74fdldunthphk9g/luteseli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=g6pd+list+of+foods+to+avoid+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf96.bin
1b4e6ee6318db6451474cd297ee68af4aae8ec37a410f5ab14d41e2579b41e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 5184 bytes
font_01_sfnt_off0000e15b.bin
279c4b777df6643c87303ef5d8aa7278c7b60e3c22c5f031922b2e8f4b0d6923		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 11140 bytes

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