Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fc9f6198a83b81…

MALICIOUS

PDF

95.4 KB Created: 2021-09-13 05:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18e8e99a771f53e4b354c8d62744af13 SHA-1: 0e9a5efff99ebef340d901d4063418d52f1ea425 SHA-256: e4fc9f6198a83b811335398a734cdfc6b4ceb40eb7b5346378825689d3472cbe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to external URLs such as 'https://pistant.ru/uplcv?utm_term=free+coins+slotomania+bonus+collector'. The presence of multiple PDF links hosted on compromised CMS upload directories further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pistant.ru/uplcv?utm_term=free+coins+slotomania+bonus+collector PDF link annotation
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c7189995---55951706841.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/4219146231.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/tamodofinulipefakiwasib.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/sesozof.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/raburulelazenabuni.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/84751477445.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59886423927.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kafinobefafalosapurotit.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/17280238151.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/3580073522.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/49099160006.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/razijidokijamu.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/77591266938.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db080f2662---62911645708.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/sitipezibu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa3664a2b---57118480331.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/pojeguvukomiperafezowet.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/nisodovetiworodawo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d5799d28---31151686981.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/21138278543.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/6586302840.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/jewalawuvelumito.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kugilakufimefironexawo.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_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 10608 bytes
SHA-256: 0d24b8cdc4bb0484b84a49db9be1a5b248602b70b3939b895cbc23ea4fb3685f
font_01_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 18860 bytes
SHA-256: 7dabc020a075625e14cd1c185a2c0e6aa6b0b1973ef0e04213f2b9e8d602bd77