Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6b9ea0128e0d06…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 12:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b74cfcbabe3f6bde877607905c9f9d2 SHA-1: 8bb6ed7e0ece737d7d27a5d7109b355a86eaa00c SHA-256: 7e6b9ea0128e0d06c1f75d2f099867c395ef79c952498f66e21c32e1a7d54c36
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The primary lure appears to be related to game downloads, as indicated by the UTM term in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=gta+sa+on+android
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cfeb4aa0---96532587779.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021090212192673499.pdf
    • http://z-sinpro.com/upload/files/86985302568.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/56732749825.pdf
    • https://uslugiinzynierskie.com/eurostyl/photos/file/rusiwalojinomunarap.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2709e5897956e0665b07690bf68459c7/49963239976.pdf
    • http://kfnmsz.com/upfolder/e/files/20210911160751.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zodiz.pdf
    • http://geologocarmignani.com/userfiles/files/79703047393.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/bomunumituwakoxorupixi.pdf
    • https://posetili.ru/userfiles/file/73399056670.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/kigulegagijaxunenetoga.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86416652397.pdf
    • http://mayphatdienngocquang.com/media/ftp/file/zekufemowotewuduvagixive.pdf
    • http://bigdoughpizza.com/uploads/files/gozojapagugafunari.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce5bf5ef19---62369538822.pdf
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/moxiwinoxesu.pdf
    • http://medica-brno.com/files/59328016291.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_off0000db1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 16792 bytes
font_01_sfnt_off0000f332.bin
10d1d9945b817f0be5d7f7e84fd7e666cb4f3db120aed92bcb9f153dcc34b858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10100 bytes
font_02_sfnt_off000109d7.bin
5881cb9ce4067655473e4e9fd69ff23681da0f7eaaff1a4983fa261f0313ff06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 18924 bytes

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