Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9de95c9681c6bf…

MALICIOUS

PDF

84.3 KB Created: 2021-07-06 02:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c5fcc107552866bfc8ad5ebc3db582a SHA-1: b885c7e9d64a905a78cf362b560caebbbf477eb3 SHA-256: 8d9de95c9681c6bff1f3e1718eb4e600943d34785937e15ca63039508f807c35
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of a 'download button' lure further supports the phishing and malicious download attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608588dd59204---bafexusebesaf.pdf
    • https://alrukn.co/userfiles/files/vobuwogopuru.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f596b7346---kunopunafomawed.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0d6d8480---34092583749.pdf
    • https://activepymes.com/pub/file/refovikel.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/99887719329.pdf
    • https://mfdesign.hu/files/file/sunirij.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8e1c0059---dadefasivapovakagonaf.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/95661954478.pdf
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/57937463553.pdf
    • http://luingpyrex.cz/foto/Image/file/52146752965.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0f7fd31b7---madesaw.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a470d0ef7a6---71273012071.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/o4uvlibraefp5gnd4lm8o67kmu/sazawotenosuzosamumoseb.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53140e3c1---53649228522.pdf
    • http://lblussana.it/images/file/danidoxijetunu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ee9317e8---91839086466.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ccec9b24---wiloza.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0063b77feb---96728001081.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090154f980c7---govizonikumifezuv.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/384f31d2919917793be5f86c144bdd48/56807247988.pdf
    • https://clumba-indoor.ru/files/files/61275173983.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/3685396415.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/122ed59f154edd66d9758d03038f9200/81233797954.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6962328ddc---42388991374.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+love+happen+twice+book+pdf+download
    • 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_off0000e79a.bin
1697fc1a4813e003f9ad4a164da1b65dc29a040405ed90a4dc8960e8d97e2da0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 10864 bytes
font_01_sfnt_off00010079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 16792 bytes
font_02_sfnt_off0001188b.bin
ec8024c4c7c9410987201c37a80a1caa69d3ee2dd399b6c2c619e03f277fdfc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16820 bytes