Malicious PDF — malware analysis report

Static analysis result for SHA-256 8987644a7de951a6…

MALICIOUS

PDF

91.1 KB Created: 2021-08-15 01:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b978eaa33cfb75da45f62ea5c726f68 SHA-1: 1efdff9c9ff276fca7ba526f005b72ad47f2881a SHA-256: 8987644a7de951a6076db03dd5f62b275e1df6706cd4e856f85a52e982f5e214
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=design+for+the+real+world+epub
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6298777dd---gaburigakuxibifolew.pdf
    • https://ambient-interier.cz/files/files/37306934386.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ebb56fb9---nokudarezazajikubul.pdf
    • http://daebokjungdb.com/uploads/files/65941153148.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c7af045---49803671696.pdf
    • http://tranindo.com/Uploads/userfiles/files/vibezotoxafosoveteb.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rhgf88j5l04qi43hr5g3lchnv5/62021273114.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/43094497038.pdf
    • http://fine-cottage.ru/userfiles/file/97655031867.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ock8ongrikvfbrl6757bqv8393/26041607595.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fijofezejiwazekag.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/65f6e5e70bf4142d137ed45cd79ad5a5/matinixofek.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ea550ed---jobufinonekesonekotade.pdf
    • http://palenice.net/obrazky_clanky/file/lipebatusi.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5b677c94a5817db497261baec12a744e/sigakibovowetelevawasa.pdf
    • http://cnmrobotics.com/files/files/19064171997.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc26631f0fa---jizixedejadobikile.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef86e25b2a---bizozukuvavivasalososibag.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/72b1977ac5c6e621a00b8c2ccedb6c40/rokosun.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8faf617e9f401fe33fc19280de1039fc/pigomi.pdf
    • http://files.ibiza-ferien.de/file/bepufagojemukufejutomuf.pdf
    • http://nitexprofi.cz/userfiles/file/73940277979.pdf
    • http://chongros.com/userData/board/file/17712076111.pdf
    • https://detectiveoffice.net/userfiles/file/94607890158.pdf
    • https://takipcisec.com/calisma2/files/uploads/14446208313.pdf
    • 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_off0000ff11.bin
38ff0a4bed96f420a7525736e97e8e65040f2f627f8804cbc73856a7c8f3d576
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 11104 bytes
font_01_sfnt_off00011886.bin
f91acbef1c1cdb365ee8453f5c43ad4915853b950deef1003ebf631e077aaabd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 17452 bytes
font_02_sfnt_off0001466b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1466B 16792 bytes