Malicious PDF — malware analysis report

Static analysis result for SHA-256 1429c5b379f0a3cc…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 15:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d01a72f07cf0b3bb99791bacd1a319b1 SHA-1: 85b6bfa4b2a86bb8ec8a48ab3f6541ed95c8c03d SHA-256: 1429c5b379f0a3cca96bff32ed2f792b51007aea0688a52bf577790371fc8dd4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic firings clearly show a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://abwgulfport.com/uploads/files/fefipeb.pdf
    • http://www.aluvascientific.com/UserFiles/file/43026481926.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f73adace7557edf1bb4ef64549a983ae/tuvazabosakiv.pdf
    • http://vyveva.eu/UserFiles/File/26139495144.pdf
    • https://veterinarycarefoundation.org/userfiles/file/zumexazefutaro.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718380c66b0---jujitavi.pdf
    • http://emilygrilltogo.com/uploads/files/9312091486.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701d6709c49---59308343093.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2607a741b23428f7bb4bdc5c9e85fc1/matof.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a24e9e426---38576939742.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/23343af6252d92e6b94dc58e65368652/wufolinesara.pdf
    • http://apexibd.com/uploads/fck_uploads/file/jefugidazun.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a001f912331---xiribojifuj.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092718a3b369---dovowusezonowaxaka.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7djseg5spohdrd2pe01nfvt6af/60218544674.pdf
    • https://organicfertilizerproduction.com/d/files/janezemoti.pdf
    • http://accronline.com/userfiles/file/84679991651.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4fd38a8e---11123786292.pdf
    • http://homeopathyhongkong.org/files/78581162587.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/xunonatelixorarowa.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac94775adfb---48406756187.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0469a1fb---bafaribazozobelunekase.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/35ac61c06753acef2a153689cf1d27f3/70936795022.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a41f30b2424697f9fcc7a7aa82f861ed/17830595601.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+adventure+red+chapter+complete
    • 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_off0000e889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 16792 bytes
font_01_sfnt_off0001009b.bin
a069f3ba100e89633e589e0b19c1231cb0afb090453e24906dc1fa73bc2f5743
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 19268 bytes
font_02_sfnt_off00013236.bin
dfeff6e7a4b896835cd0b48219b28e53f31c7c9b6f539fcf0256eb134eddbc27
pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 10780 bytes