Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa449b9168d1b4c…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 04:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 444cbf5cd4855d34f1fe0d91a52e763e SHA-1: f35b3b9bd306981be815f3e506c5d47e97561ef6 SHA-256: 3fa449b9168d1b4c4b7dc409c2578c479583e80d3044b567123caa8697afb470
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable hosting domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The use of multiple domains and the structure of the links suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://food-cloud.com/home/food-cloud/www/site/site/data/files/29640100444.pdf In PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/92568620184.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109300928336539.pdfIn PDF document text
    • http://space-edge.com/upload/files/6146997436.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/16833940367.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/97985235695.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/58446249055.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7f75a5901---zifinisezenerujupave.pdfIn PDF document text
    • http://nessium.net/userfiles/file/10403159665.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/defulonabanepula.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/471c19ffefe07e5d74947f94e359f475/29250795842.pdfIn PDF document text
    • https://coevent.ru/upload/files/87848022250.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/26503763681.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/64724150939.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091616535280554.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/54719999993.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tilikuvojapubeloj.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210922215426.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vekurolodifubukubevesa.pdfIn PDF document text
    • https://soechi.com/userfiles/file/zuboxeduxosupew.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/36879698332.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/85236373785.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347dc3e44bf---sotekoniwijugewenuguv.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/24835870552.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rutip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pixel+experience+android+10PDF 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 15752 bytes
SHA-256: 26dd5f6d139484b902d35e6515709ad4c87996fdae21dd8385a027759f6944af
font_01_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10520 bytes
SHA-256: 1fdde249895fcee795a20f0c300284f395d722ec110512c43d42c499ccbefd76
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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