Malicious PDF — malware analysis report

Static analysis result for SHA-256 a127378f65fff2ad…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 05:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a9d95b889e731de67c2192ff4506314 SHA-1: fa45e587764bc762b6b12e9b72be03e890b6dec1 SHA-256: a127378f65fff2adebc6c2feed8ed3d520abca0d1ca17c9c5eb6ebc0db93d974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d088468233---makugafojuvizix.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd21e6f5a---33559140823.pdf
    • https://123natura.com/stockages/files/teneletekuko.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076813874324---xetini.pdf
    • https://weeb.nu/userfiles/file/meleputuwosas.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/lupujeworoxirinubipurarov.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5bd35847---7885097269.pdf
    • http://roxburyhs1987.com/clients/63080/File/38917735831.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607000170ab1b---95872355074.pdf
    • http://hoshitorionline.com/uploads/files/pumeno.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/c53aac6f9daf3e0e1287a413808e8859/dubevafomor.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mkn0cm2i30gpa0u3c8idjvahcn/52641430202.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/aa5d667e44b607bd8c6ef1e8aad74275/jenabomuvufu.pdf
    • http://project-lovcen.me/userfiles/file/retuluw.pdf
    • http://nandeestationery.com/userfiles/files/witopizefezinofujiwa.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3de3bdef7---gerelebinutu.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r9phbv7c8b65uac1mm45coml62/1882257479.pdf
    • http://nowyhotelik.pl/userfiles/file/2959099472.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c4fdc2cda1f113f75f936a7ffb7d3425/zuniwiduwufek.pdf
    • http://kimhoatra.com/upload/fckimagesfile/50192897339.pdf
    • http://reguitti-engineering.it/userfiles/files/towuxilazositogive.pdf
    • https://ewastexperts.com/userfiles/files/5219267663.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9nu2hb85ljphqtq3vl9g7gn3s7/32968124346.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/jirepabibetotirefaza.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kugibakukorevi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=4+stanza+poem+about+family
    • 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_off0000f011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
font_01_sfnt_off00010823.bin
ffe9ffcfe96d6a2986d8067b870fbdab658a3d961afb71aa2388d5864bebd047
pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 16988 bytes
font_02_sfnt_off00013441.bin
25cb5c241cd03d9c46beb3df833dce2d940a46559f4a242e62798a075a16eb7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 10816 bytes