Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9322af278de10de…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 19:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0343d9990b0e56f000db9cbe9a2f236 SHA-1: 178e161d4c93ddc5a03fb3ca1582dc61252b136d SHA-256: f9322af278de10dee6188ce6848d1d9ed9cb85c2ee5124b485262394c8d75cc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://archism.ru/uplcv?utm_term=strategic+management+of+technological+innovation+pdf+download PDF link annotation
    • https://lukili.ch/UserFiles/files/94404621370.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/sexusi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611124ed8a6d4---nusakapojusu.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/luwoza.pdfIn PDF document text
    • https://wita.lt/images/files/teziperijosif.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/pukukeg.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vodalawulirabanamufa.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a24069485---87975357505.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/15466659544.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dee4d3f5---sabefifirukabapefepigob.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7bea5b207c90417ec89c45e6f35b3efb/55000951638.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/raragunodesijateriwomo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb8767937---49245059815.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/98717060195.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160756e2ec291d---4367796715.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/fidususek.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/84241392558.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/53713845834.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/83565446851.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0a4cf6840229b55ea97bfac7b79ccc00/jewurozi.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/63dd1b3633f1f0a6a96be4e435664148/86488733911.pdfIn PDF document text
    • http://artside.org/data/temp/file/38485201743.pdfIn PDF document text
    • https://tangentemag.com/img/file/5779040926.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/25961969384.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/jumomuv.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/191302544222.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_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 18732 bytes
SHA-256: 5deef242c734daf8bdf994f7a4c534546bc272adcc36707896aab1caa6d258a6
font_01_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 11128 bytes
SHA-256: 33732a7d69e207f5d4a05e1becb9c587fd6e4a574418cb1c4fbf7974e1b5025d
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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