Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0671cb8535c237d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-23 15:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94d8a96ac43acf38d8513f523502c4a8 SHA-1: 07c0c75623f223c118d70461487daf96fd876cc7 SHA-256: d0671cb8535c237da3c06b0bfcece2dfdabbc34481602f0f203ab3286288a89f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://matstravel.ru/userfiles/file/41185094886.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5e64fb7946c6c7f0d2e289881b92f5de/35295642621.pdfIn PDF document text
    • https://jjpremiers.com/files/64013367747.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/femigunasudadoneg.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/596b07ed47e80bafd301c6a45898294c/bebeganavem.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7f20772453acb7dfd59c33c23efb5588/90344466668.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fee51473b---japazo.pdfIn PDF document text
    • https://0900107678.com/upload/file/50268619006.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2e945ed1fefe655794ad505aaeca54c5/73749689995.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/3492711176.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/11277689971.pdfIn PDF document text
    • http://jucal.es/images/file/20819470115.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/82300239521.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/kokolazipefadidukunu.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/dozufomasevunusidobenek.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/r3ve7a40sn0sksnj07a1u2n021/redexipojixatejuwe.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/95bd9b0a3040fae52d0fb5c0c87c3b3b/riziwopurubirux.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/2915156100.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/sajixiserifuxewezerud.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/dutezowajagipika.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/so9gk1u0ftv7c79abiogceeqi3/47019466170.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a3f72534---44333443193.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4ef9637992adae1b0244657095313a5f/98574036835.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/425rtal659no3h50iqhoei0t0e/wazagamirexiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=move+to+canada+from+us+requirementsPDF link annotation
    • 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_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 17212 bytes
SHA-256: ff65cfb86e7f75a92e4cfefb4c70c452f73dfa30c21acc9b144590b7842fb993
font_02_sfnt_off000131e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E4 10896 bytes
SHA-256: 6240ed5f41c43915db656ab452c9fde0dccd84d7867e324e3f3c310a1c4862c4