Malicious PDF — malware analysis report

Static analysis result for SHA-256 352e6088abf2d1c7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 07:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b718670a3c5d998d605d218447de2297 SHA-1: 13c95bd8451ce89d7fed57342e49e4d76afaaff5 SHA-256: 352e6088abf2d1c7a885feb3e88d40887285d2d35a071a71f0a28853479d941f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=cell+phone+screen+recorder PDF link annotation
    • http://kolasinprevoz.rs/slike/files/79367704001.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/45426800380.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de734d137---bigititojugetujegagot.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8cdd92e31---soxupatoziwapawenedo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b1b7dd80427bd3c323b21603186b2c09/5727229727.pdfIn PDF document text
    • http://gistys.com/userfiles/file/93482780545.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108300957506869.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210708050049_o5pcv6.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/78762576930.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9787be2c1a---wexeso.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/dumukemal.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9087cae78f---29750212410.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/11990249495.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cdf2ad430b507c3750bc82bc06e049e9/baluxizimagobavafulu.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/kozinapizuja.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/58571537045.pdfIn PDF document text
    • https://redac.ch/upload/zuvarotaxepasobazerito.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/57cte8m1aqgfmuciouo2tf6620/66058077683.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/48517315081.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/fikexemijadaxip.pdfIn PDF document text
    • http://djapm.com/userfiles/file/34941260606.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/2586079148.pdfIn PDF document text
    • http://aplus.to/userfiles/file/fodige.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bda8cf2f1f44d76ebebd60d831165330/potolenawizugitusoxebin.pdfIn PDF document text
    • https://ambalatender.com/upload/files/zazosapazedexeta.pdfIn PDF document text
    • 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_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 10288 bytes
SHA-256: 3a1b03ff63d4ac8dcff78589224be20343e4c502e5db93f50b30206174f5e629
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 18276 bytes
SHA-256: 2f71ab37fd686f198304e19f2822937d1544c945df737461b378a821eae8e07d

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