Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f91920b95b5664…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 23:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f14ef1b70a5a2d7cd4db9f23e7ca269 SHA-1: d945986396df09fd2dd6301e2240a4e666b7c508 SHA-256: d2f91920b95b5664d6c02a886814174d9ba3da5596dd77ffba8bb4da7b83dea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=html5+css3+to+pdf+php PDF link annotation
    • http://shelton1961.com/clients/35589/File/81061162912.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/jivarezefaxapikopozoz.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/87925343071.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/sazurifusurupikuridunoj.pdfIn PDF document text
    • https://medtek.vn/storage/file/90261352461.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a4a239c3---gevoji.pdfIn PDF document text
    • http://dongphat.net/upload/files/16726816133.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/11388675651.pdfIn PDF document text
    • https://etadelloro.it/images/file/rilobotapuwekikasun.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/79266900762.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3apar5l9kdmtob2t1vl3vad6q4/tiwerifunotazod.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/gudal.pdfIn PDF document text
    • http://bwc.lt/i/wilimalosuxoxupozabe.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/50609305167.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ac1f7dbd7---mesobarat.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210714120523_snvkli.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c49c1330b3b07470fd81cc6c13ab0dec/garurofazapuzelugoj.pdfIn PDF document text
    • http://k1a.ru/images/files/file/29927103331.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/28678994464.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/maneloboruw.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160797d18aaf7b---56869010298.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/39642356692.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/vasegufon.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-7/20210707140944726663.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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 19080 bytes
SHA-256: 364f6bdf5e2f00ce3043b633783bedf837a49f2a64afd7c3c94d41346725b6fe
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 10592 bytes
SHA-256: a9272a13ddaa973fdd9025850fc794d8f2dc5e9749cb154dab7dcf4d6eb58d56
font_02_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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