Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0959752a7bb2cfc…

MALICIOUS

PDF

80.7 KB Created: 2021-10-06 19:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 189477ba8439094e74292276111b9c48 SHA-1: 041183faf76021f872c6d0f847cbeeb36ed64116 SHA-256: b0959752a7bb2cfc387a5451087dd3cedd57ea686373287d5f1eeb220354dcb1
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=blur+number+plate+photoshop PDF link annotation
    • http://koryosushi.com/uploads/files/46289653323.pdfIn PDF document text
    • https://campermagazine.tv/public/file/53516787611.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/sanarovip.pdfIn PDF document text
    • http://web5gstore.com/Files/files/nuvizixuzof.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/42428338360.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/gofewubamutawowonabi.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vugejimagaxefafaparo.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/12/file/41849610781.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16147459947b6e---juwukuge.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/mibape.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e6ef1e247e3bd2a2eb189053dfdf637f/72098305613.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/83260994565.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/15443621318.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/wotifanamunukota.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/mimawirop.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mjed95nt1oooqdm94i9256pm52/52499980554.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16150eb6eb3ef8---55778301126.pdfIn PDF document text
    • https://mashura.co/userfiles/files/589024232.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/burokujisezofaputok.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/17f0da0810b548170eb3755628ecd31f/kedovibedisenupubajivele.pdfIn PDF document text
    • https://777mto.net/contents/files/64061274356.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/23757393543.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/pofosuxepevigofololibiw.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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 17828 bytes
SHA-256: 335091d289ff2e57aa6eead8b496f4aff9799ca4dd34e7b6dd99fe1bc1cab11b
font_02_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 10720 bytes
SHA-256: 3cc71ba0a113223f6770ba5d10a8f07e9600ea66c7129920518d6a049654ee8c

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