Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718f155f68dc2e3…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 19:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75b34c124f49edf572d795b86e5b1b73 SHA-1: d969af59aaa1227a563ff901a51f5648a0682a90 SHA-256: c718f155f68dc2e3deedf72653b0278276312191c95155b639d44dda7bd5a0e4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. These links likely lead to the download and execution of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=halo+kilo+five+trilogy+pdf PDF link annotation
    • https://dineflon.com//files/tosolukurelezelige.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf0a3aae4---felodokerawozujovigag.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f508daabf95---xulawesojelilonujarenu.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/wamisiruxariwibita.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/xudipexegobaxumuputekola.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/98179468947.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fe7b37b93ef7b48ba11867e2e3fe5aaf/jurikonuvegumijiveze.pdfIn PDF document text
    • https://advik.net/userfiles/file/72503099492.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a2110416f70b138493927508b1a53719/32762081719.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/xitenajakavote.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cfec7aed689ce89f93e7e463765710a2/57444889674.pdfIn PDF document text
    • https://masihpt2.com/contents//files/6074284393.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/ruvulaxiwuleb.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/petegefutox.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a66c6de4cf89a44fbabccc6d6ed0823e/31102076034.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/mazigovamepasu.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/bixuzitif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c27a907fa---dosotuguwilesologe.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/83323551019.pdfIn PDF document text
    • https://tch.lu/files/files/53783649577.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/83561570368.pdfIn PDF document text
    • http://npas.ru/pic/file/faximaz.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/49703607454.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ecbfd643f---23846857452.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_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 10664 bytes
SHA-256: b59051678c58b368cceb49a91ac7b08d4e483ff323853c15153fed003d0139e0
font_02_sfnt_off000130f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F5 17700 bytes
SHA-256: f5d43554e7024df7e638d66dacb79e919c15853e13ea7e6ead585da2a7e78a03

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