Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac505967582c5c5c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 10:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a77faca77f9cd2b366d8d9e8689f7a SHA-1: 2e264881db216edf00203a2f1e4305a8ad47d71f SHA-256: ac505967582c5c5cf3cb44c320a0ce4b11c814d85f86394d081d94790c55a358
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=love+u+shayari+romantic
    • http://ihanzao.com/userfiles/file/20210914001008_1550732845.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/88841734147.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/mijedopowogomotul.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae11258df2---sewixixipabizotexup.pdf
    • http://kfoodntea.com/dataroom/file/kizopizixokepawitofifub.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e22778fdb---zovikurimuremoxa.pdf
    • http://gamebonda.com/ckupload/files/rafimewuwojinifapap.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/67143598381.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/powarezirajopalupuparavu.pdf
    • https://glycocalyx.nl/userfiles/image/file/68066613987.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/52634629178.pdf
    • https://optical-axis.com/uploads/files/202109061305547755.pdf
    • http://toptoptraining.ru/img/upload/file/85082842120.pdf
    • https://jackinthegymtpe.com/uploads/files/202109102038219046.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137de1c6f20e---kogesamoxumopagugef.pdf
    • https://suma.ca/upload/editor/file/40571917499.pdf
    • http://erictex.com/ufiles/files/gejedokawetolamuves.pdf
    • http://csc025.com/userfiles/file/20210923071237_ekrdkc.pdf
    • http://www.lnk-creation.fr/upload/file/89295214905.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5fdcnluvm2op7umo9bkusrfqns/xidujulapu.pdf
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/pukubenatederogij.pdf
    • https://hongmao.tw/uploads/files/202109220906226447.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_off0000b17c.bin
3a61fcd7257534856d0f17a395499a38634821d2159f1bb4c834cbcdcf492d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 10684 bytes
font_01_sfnt_off0000c9ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 16792 bytes
font_02_sfnt_off0000e200.bin
74465609ac6c11a08e6ea87b4330ac4d304ef5390c4d48dd482f4c13f8bc2457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 14812 bytes

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