Malicious PDF — malware analysis report

Static analysis result for SHA-256 72abb1c56d1210ba…

MALICIOUS

PDF

87.1 KB Created: 2021-08-17 13:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 35b72afd1e4b421c09ace9b0eb383499 SHA-1: 437c7252f52c8ae22ee8e90109f60d128dcb9ac3 SHA-256: 72abb1c56d1210ba9ea0ee5df201a2855ab94105ba2f35d7184953f093d965e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cafesca.org/ckfinder/userfiles/files/44898333816.pdf In PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/73b7c759046d90f7b1da0d1d9dc8cd28/4892473896.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/19164495315.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/punilume.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tewivejomodusuwusiwu.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/25385664376.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cab988e9---bedetufisa.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071675433402---4194217851.pdfIn PDF document text
    • https://maviet.vn/upload/files/31151451511.pdfIn PDF document text
    • https://blogsma.com/files/244726523.pdfIn PDF document text
    • https://ekransamara.ru/files/59569436265.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/fb3982357061bb6733e4e5ac0bf1b9b0/xutoteguvuwekokapepoja.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961ac3b73b---39862892564.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/86841191128.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/zalozifimafawemebu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a355c20893b---47933799609.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8957b7c783---95445746886.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8fb8728e3fb527daf842d7e88523d675/72218028098.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/21653441536.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m9ma31ue8krh8ib8jivod4fujl/55210135253.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/metefomalibusagidulujeseb.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/72651467234.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d451b27b8c762d53938e2476a5e6dd68/ravijiwuveteme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lesson+5+skills+practice+solve+multi-step+equationsPDF 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_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 17144 bytes
SHA-256: 5fed416fbc77d5ed77e61ff96c646b4dfb54cae1526d2b906f81da4706878172
font_01_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 11064 bytes
SHA-256: 3bfa650a8d1c6036861d5e58e076369321ce8a593d4f44ec8b8387e8fe3c9914
font_02_sfnt_off00013529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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