Malicious PDF — malware analysis report

Static analysis result for SHA-256 7034dec256cb8458…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 23:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b47bae99b7a107e7687b4da3fe536be4 SHA-1: 8165cb23a2bc057ab85953a5cfee92165681631f SHA-256: 7034dec256cb84585b44f8c8d78428928fde9fb98c660361f4efd5cbf7564582
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6c2e2227---mimifixipedeguziwevef.pdf In PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/89093178613.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c876a2bfe10---woxizibezukowimifibo.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sikebirelufekesubewirurof.pdfIn PDF document text
    • http://gujaratbusinesspages.com/userfiles/file/lizotalepunu.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomuzesilixuxak.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/12669028098.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/828850039610507cc66e2d.pdfIn PDF document text
    • https://rosycaffe.com/file/23237122104.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81770908d---83230032233.pdfIn PDF document text
    • https://zhansq.cn/upload/file/48014984288.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210727_020759.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/76057655174.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/dakagalu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/80816424049.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e200ee82---48390922741.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c111e1518d20e2f884012e106c33c8f3/zozejadoluvo.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/64101334269.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rebavano.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4a5efded24563aa3bbe455d98876821e/1653342474.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/sewozotivaveligeroxufog.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/nilenuletalevufawasubaw.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/34066746991.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/89070567881.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/juguzevosarat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+base+town+hall+5PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16728 bytes
SHA-256: ea4b2ebcd22873a2a3057696e6b1e6d2acc2be56335e5a766244fefc8c08d73c
font_01_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10428 bytes
SHA-256: b873de59e9bff46d73bd3c18961f2bc536c70c36c6aa703844dc980450f66ef7
font_02_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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