Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d728c0d85b0064…

MALICIOUS

PDF

89.5 KB Created: 2021-07-04 13:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8502a21ac632b79bb538824943793a7c SHA-1: bd73dee309afc1826288ed8401c5e543d76cdc69 SHA-256: 00d728c0d85b0064f765ac08b97c284cf94c01fc0b0be803373f3d555df5e802
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, suggesting an attempt to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d468917c13e---27830194851.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/bebd97c12a0ac84d2a120226d5305afc/34071489121.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5ef67bc179f029ebc396fc6e2ade4395/wegogapuko.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9721a49567b92cb6a699e0de9ae45659/vawolidewubixuxuzavoxu.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/39018877017.pdf
    • http://akhsmombasa.com/clients/861898/File/lewukanuwamowilekusazu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099da12bb27a---88554441191.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8466cb015626e32049703198060171aa/tifagetomutiseke.pdf
    • http://akinmedikal.com/uploads/file/jelizekujikematezuwidow.pdf
    • http://alliance-ltd.com/userfiles/porilorebon.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1f3d4aaa146fdf21975d65c7bbc3fe80/ponevugaw.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd245f1c19---kaxozikubinibipemi.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad761baf90e---legudakozupovepazu.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/birogolodonolesi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc1c3a2df---33478901219.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448aa80a73---rewariro.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t69k0s02cnk7gkghtnt14jlvoc/fexokefosog.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0d20c537---91450920100.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/3601036842.pdf
    • http://agataklimowska.pl/userfiles/file/95319949.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e65d21fb85594cf62ccb545628e6bbae/sidamezabufipi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4dba924ce2797ec3c62dcaba1de53cda/tiwuvasokewatibirazeso.pdf
    • https://vansuloi.com/uploads/userfiles/file/damatexu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=this+is+how+we+know+true+love+lyrics
    • 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_off0000f545.bin
5f573e8c5beac7b43979430d944e1d349739464e61221f75f325099e4c2e0fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10588 bytes
font_01_sfnt_off00010d82.bin
a4229f68989f22bd2629b87d6f9fe3edc98be88859784db8d198edebf3f76b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 19888 bytes
font_02_sfnt_off000140aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140AA 16792 bytes

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