Malicious PDF — malware analysis report

Static analysis result for SHA-256 47621ce3b84edd0f…

MALICIOUS

PDF

102.3 KB Created: 2021-07-02 08:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b4e3192251178c17c817a961736b7c34 SHA-1: 961ba3553ea96cedefd2ead64328d8e462fc25e5 SHA-256: 47621ce3b84edd0f2aed532ad3272c2e47912532c017d71e6dd53a59b71a01b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body is unreadable binary data, but the heuristics clearly show the intent to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/865e3cba27c75c6d2894d5c2838c2dca/dusol.pdf In PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/63523916234.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/71535935366.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tiritinobabomedivakemev.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/20528968101.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/538df65106fca2ebd0c5e3f9e5210f98/rikobulupitag.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/29264405576.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/59967941291.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5bb1610637d59150712f68394065a547/92753413211.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7f1eed36a294cff055cddf78d4178982/26312166596.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5l7nc4h2ij69u6r3hlgpcctdrd/88475751875.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/87327101189.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/turidokolivapelanukulav.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xudedobikejeniwigolimi.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bagoreg.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/n75fo4v2aivkhte3u9u2p641mv/pakovuridawe.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc61e98ea---74753023682.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/0kj9on9gkppbm7aujv64rgacs7/wumotudizegopa.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980e7dae78d---15107462224.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/95587244941.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9ccd4a3a0fb6d1fca8f583e611dc1dfb/47244084266.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3tpuqcl1cg2fju4k7ff3ijlttt/pelobe.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda4aee4bc---fejurirofemo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fa8apgp7rk37n7vb50bt16m8ri/rafijosofokubajaka.pdfIn PDF document text
    • https://beaszemin.com/files/32748646853.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/44499157293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=welsh+springer+spaniel+puppies+for+sale+near+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 10800 bytes
SHA-256: bd8a0c5ce28dcde7b6c527b761224bc4ab64c6e28a63db063139bddb72e22b22
font_01_sfnt_off000144c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDB 17224 bytes
SHA-256: 213c6927cd9e1b32f26d5ef5ae9055df99695a3746b8960214d6f6f259acca1e