Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84cdbaab92b19d8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 00:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d2416d180e1cc0a10d0e08c5f698ec8 SHA-1: 35ec94add341664770995c0cb82e61e84409a5ab SHA-256: c84cdbaab92b19d8a27084a03ee84e5931bde51876ad57f5aeecfb2082b286f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/q4av0s712ojgevlvel27ij8476/33578768707.pdf
    • http://vinhthuan.com/upload/files/gimobirizeferam.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a751ab561---87959756838.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/punefewenaperuzuvu.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7a05965e0f299b870d9b807fc2181136/39695663763.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d60450bd8a4af3c883af020f78715433/54149708055.pdf
    • http://ouhkpthaa.org/userfiles/5113426449.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d7343af17631c568204b92259a5b680b/97333347377.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a5af7a3fca874bbd2f200129b113249b/88750730317.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/94822658219.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/zuliparureguvugivekenimum.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tam96qq5r8ot06r17u36qt9v9p/zegadot.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725bad06a35---venemusobutosafapodoje.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a9ddd3af---vewiladudajunurikovediwul.pdf
    • http://blueyee.com/upload/file/15134325897.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eafbbe93b---43037606585.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a750c4e1734---denanopakanakobis.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/50777075621.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16200789834363.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/728c12e18e9c7337f512160ff3289f85/jalepixavub.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd8b54a0fb9a7af5ed2f5d3506a6802d/49951857640.pdf
    • http://dieta-plus.pl/userfiles/file/fitewuwezaropomajemew.pdf
    • https://open-call.fr/uploaded/files/73668778005.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=canadian+contract+law+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_off0000e2fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 16792 bytes
font_01_sfnt_off0000fb0d.bin
8a6e83d423df7433fa6c34ebe63c0a9f99f0f260ca51cbfed52b43c48bdf32be
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 18508 bytes
font_02_sfnt_off00012afc.bin
9ec471715b5d5ff929ef41ab5be1e4731b32136dff127935acffaac69b2565b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 10428 bytes