Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58de4ab5bc11e52…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 07:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 653a318606801325aeb20ba0b3489b3f SHA-1: 46715cdacc07f11b3e94524c04c1b1e9f10b39c6 SHA-256: a58de4ab5bc11e526ab04a5d16e5b5e16b134b769dec931f89fc478a12f5e4fb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/farthm009414313cb0gljr1ce4/petawer.pdf
    • http://perles-del-beya.com/userfiles/file/banoziwedigiraxanira.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/cffd3ec94e398227c6bf4e2d3760b122/suzalesexofivinelanulap.pdf
    • http://wtmongolia.com/materials/file/papofekulobebagewemugot.pdf
    • http://apexibd.com/uploads/fck_uploads/file/60915611913.pdf
    • http://effektfilm.de/files/file/gojadevabek.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d64b1ce63---sunikojajevufona.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/741491aff5f58231a58cf805f493eb32/lageminogivijafiwulojapum.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725527409d6---57035699638.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bff495254---72048103772.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/mopufupizosut.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845dc91ddc5---38453102874.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f38cb366b---ravafojomajojatotuxokako.pdf
    • https://xlspandoek.nl/userfiles/file/95662640695.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gutaqqh9necocvpc38mqnq6nsm/91954692910.pdf
    • http://dhf-china.com/d/files/mumitovekasabupukuzojaxa.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/667e72856606023032ad68540281f816/rukuj.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3211575c9---nagorif.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eaedbbbbc---44013389334.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/73i77pcneebqg0lck32b412k6c/34126581156.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694887e637---faromemodedajulo.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4il1gru39bem86vp7stit4d0ba/24694369029.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=labour+office+contact+number
    • 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_off0000ea6f.bin
adbe209107618394a8f57609333f2aa6738acb54944d8d6346033d564e6a7e37
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 10480 bytes
font_01_sfnt_off00010237.bin
7a851d1f77818a66aca25135a3454d2932a5d2a4042108360d83b14390c133c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 17292 bytes
font_02_sfnt_off00012fbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes