Malicious PDF — malware analysis report

Static analysis result for SHA-256 18929e694fe7798d…

MALICIOUS

PDF

87.9 KB Created: 2021-07-16 02:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad99d9aaddcdf48b191f4a4fa287f030 SHA-1: f59a3d93ab4dcd52f7e8680049baeba0f8e4801e SHA-256: 18929e694fe7798d7212535eda468ceb742532fc2790cf6c86ebdfbb05c483b5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

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://lamthong-marchph.com/piceditor/file/28520361734.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e856f60a9eae7becc4634ecee1c7dd23/68006727091.pdf
    • https://suksesunited.com/contents//files/1737898145.pdf
    • http://irinka.org/ckfinder/userfiles/files/pofunax.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/harkh7ml4bgls59m585hf573gf/28340943161.pdf
    • https://pet-fashion.ro/mm/file/79021746486.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd22a663b---97850175333.pdf
    • http://tscyw.net/userfiles/file/20210622154213_9ps9y2.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/acc0438e27b2e3ed7d34c6fa4a24b041/50798052567.pdf
    • http://china-zzld.com/uploadfile/file///2021060220005989.pdf
    • http://gancza.pl/userfiles/file/mobejirilub.pdf
    • https://raiporjai.com/piceditor/file/pojeso.pdf
    • https://planet-for-events.de/userfiles/file/16344673365.pdf
    • http://pitchdecor-construction.com/user_img/files/93804066594.pdf
    • http://talleresjpg.es/img/file/95406889078.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbd1c7f15---duxejosakularafe.pdf
    • https://notrepanierbio.ch/userfiles/file/xonisixowetoduxez.pdf
    • https://activepymes.com/pub/file/29869802882.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/220023501f804849003b558b5a667d20/miwoze.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/zutimobinubew.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d267eb6---kujokupesus.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebe5d347b---62328983591.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/fqf1nlm1af050sbeggnrvua6u6/84649560018.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/34221170066.pdf
    • http://jtylek.pl/Upload/file/6664733154.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=extinct+species+with+names+and+pictures
    • 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_off0000f497.bin
077fe207aefda0e799c185e33d975ef10f1a8757edbd81d72f095c7b18d6696d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 10884 bytes
font_01_sfnt_off00010d9b.bin
ae95d0d053875379f1969960fe2ffc2bd8086e787ee9e63f5b1410ec2c96d78b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16424 bytes
font_02_sfnt_off00013849.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 16792 bytes