Malicious PDF — malware analysis report

Static analysis result for SHA-256 d754ab42bffe6a7d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 05:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48a4f883ae4960d897165c99879f3577 SHA-1: fc42049e537cafd28670cfb6aa93acc879512b1f SHA-256: d754ab42bffe6a7d7fae58b43e107a08213314931e537b4c7b1ba032d1be7beb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=best+game+boosting+app+for+android PDF link annotation
    • http://divyabodhanam.org/userfiles/file/goxirepunu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16147e327538d1---39372935717.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/68248395839.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614277813fcd4---ripilazata.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307497d0d89---vanet.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/65406416663.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/43651335259.pdfIn PDF document text
    • http://shopabrang.com/images/files/zevufejadodugafipu.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/35137747303.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/66367235510.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/55318407053.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/95814380628.pdfIn PDF document text
    • http://kgmda.com/upload/files/87811727158.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161354607d968a---60732945526.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/16694536348.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_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10988 bytes
SHA-256: 4242a90dbc491323a4379bb9eb2cf392ce824799e501672e0415612d598ecbb1
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 18140 bytes
SHA-256: 88d35feb7e2ba0397d8d351c7e60a5ba8ff93c178328e1ecfe2ed4005ce6b272
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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