Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c38b304aeee0cc…

MALICIOUS

PDF

72.7 KB Created: 2021-07-02 02:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d96b3871abae243ea606c88fd565cf66 SHA-1: 2af664ac0453933fe6b970892bcea741905ec74e SHA-256: d7c38b304aeee0ccf47d7e469f60c4f8980186c35069e9029c0c38d351a5ac83
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. These linked PDFs are likely part of a phishing or malware distribution chain, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1fu0r8i1i2hmbt2drr5h9u9jr3/tasekujemoxabilosefeba.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55bde282ce---13325658440.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5e20ceea6258c52e228b278b75404f0d/maxidabofoviwajovif.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9054a1461099b446e35a6a455a6339f6/gebodifulemozemidupik.pdf
    • http://andlupa.com/userfiles/file/84486473540.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097da210aaf6---18976476454.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f294b853e87ce0ce5d50875f838f783a/28005320559.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7d03896ee363d63e41d1a52d88a97b91/suxenubaviwubejusenugomi.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676af4dc68---xibisux.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/omhlo9j5jbhuisibv8c6f245kj/bumuririkosejebek.pdf
    • http://ahcxdq.com/uploads/file/05202837689.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/7s3lslktd8l918jhllevrrceb6/87647726076.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609668fe95a18---pofuserojuxawuwosivo.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35aba2716b---42056834420.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/jiguw.pdf
    • https://avigailpekelman.com/sites/default/files/file/vopagiraka.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/43604a62854fc73f015c213f735ba98d/16415219832.pdf
    • http://www.asslar.de/downloads/xinarijamurojawupigi.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2vidukai3vv69jhnm8r3jqfg9t/83840794900.pdf
    • http://c2ctrading.org/cms_upload/files/diwaxoliboxobozexowepuvuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=early+80s+electronic+music
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8df.bin
06880d4023bb210c4b21c4a41b46848489c9046615e76df9359d917c67cd9865
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 16452 bytes
font_01_sfnt_off0000e312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 16792 bytes
font_02_sfnt_off0000fb29.bin
17a46988c6b061035a9b65fae24af43aa18c7c8fb490e642cc4de8a721e0040b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10920 bytes