Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e28a899882ef42…

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 10:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eae6d41a07af2026e56fc4830fd4ca55 SHA-1: 31b4fb043797bdd7e85413277e70450113c86202 SHA-256: 38e28a899882ef42169c1cdf27c36824e241673a5cf4757add52ed5a6e43b909
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 multiple websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0do4uduei68me8k7svu40q6g60/waxubowatewuxikog.pdf
    • http://gamjagolla.com/uploads/files/93474095537.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/t6f0bg8j3ip26pgid3b0favpng/15570958397.pdf
    • https://homecareangels.ca/files/files/files/43258486957.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/bhpmlns0ar7hlrvor3chqqhro6/39938895833.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0a62af3---24325887720.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ffcea46d6f17d123404b4f68d1628022/tajajorijasewisev.pdf
    • http://artside.org/data/temp/file/85739996970.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/u966i1hfs700tjc02esm3r23cd/41603274058.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc0f7ee4d---18649452837.pdf
    • https://adreshosting.com/calisma2/files/uploads/judoxafudugufuxome.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f513b1f49---vowutewedizevopijopoliv.pdf
    • https://arvikabc.com/images/uploadedimages/file/zavubakenev.pdf
    • http://akkoryazilim.com/userfiles/file/mubososabosanofujelazabuk.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/73742182395.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c361dc4157a0ea0d98f0d205d07cca3b/88468287367.pdf
    • http://alrabbancapital.com/file/files/46430168967.pdf
    • https://balajitutorial.com/admin/userfiles/file/61109952308.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/77713563788.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/24pcgh334ojlbmqi4h5gbtfeu2/87194645235.pdf
    • http://physiotherapy-warwickshire.com/user_file/file/72390431644.pdf
    • https://heatingboiler.ca/fck_upload/file/kigavogitudodakuj.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fcecee3842bf3d3b7ede2e673e573466/pemiwebadiwuxi.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d031d45d95---83023376977.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86e71ba4b---74172582117.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=metaphor+for+being+excited
    • 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_off0000f4f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 16792 bytes
font_01_sfnt_off00010d0e.bin
cd28571e846a54f022179973ef1cf6e6ae6a77c32618e2ba08190b182c84b46e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 10920 bytes
font_02_sfnt_off000125da.bin
96b4201d15cfb127e48166272324527ea0973e0e335d457b144fba61ad4a694c
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 16916 bytes