Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1e51756ae7f5b7…

MALICIOUS

PDF

94.9 KB Created: 2021-06-30 05:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9748e0941efa82351b85111fdf1d65d SHA-1: eaeed9f12c1ba755f6137efe5a3834ab12d2aecb SHA-256: 0a1e51756ae7f5b7c9c277ce6dc32a8e83775082c52a151e3b2d8b74f88e726f
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076e87261fb9---86675077790.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dfbc2d68---96882185336.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7b8eab674ee0cd533fa38d115ff97183/18429907632.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b66602fa---kujazolomibetir.pdf
    • https://afra24.com/basefile/afra24/files/76285810507.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9fc3da74---91054542908.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/44828330839.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd5227ddf---solujevozavaxorekuke.pdf
    • https://powermailer.in/userfiles/file/foxiseridegogumivopezazaz.pdf
    • http://hrjok.com/uploadfile/file/49865832917.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d122b54d3eeadae33f13eeccf487075c/52548773493.pdf
    • http://saovietgroup.com/upload/FCK/file/pudezipakif.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ec789736---suzitiraxasatawimokono.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a04b48a10760b83b9a9203023883e77c/lowexodakidiwuluzu.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/412f777334ba6f42664fdcd3492764bd/98107218902.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39efdd963---bogaxi.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b676816537b79fb7a8d9f5e89dba2250/lewot.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3f25984b8a6d06542476d4b6451b56be/buwanozo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e3527cce23f632a4631dea9e2a6a2f5d/50747814963.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/79823110212.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=smart+and+witty
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7e.bin
53e05ab23ec0d60b1135aeef04b63bc10503c60f1250258c6aa81cf8669dc699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10220 bytes
font_01_sfnt_off00011164.bin
3e819b08de4f8a5b0fe102d74fdae2ffb80733bd7003d8bc4bdece8b278f1568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 17944 bytes
font_02_sfnt_off00014031.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14031 16312 bytes
font_03_sfnt_off0001563c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1563C 16792 bytes

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