Malicious PDF — malware analysis report

Static analysis result for SHA-256 305508d7af10ab41…

MALICIOUS

PDF

95.1 KB Created: 2021-08-25 20:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e74c4783dac86ad212abd14d3ac1a47 SHA-1: 613ed4fcc181a6637e0d70eae181d96fe95850eb SHA-256: 305508d7af10ab41cdffbee52ecdbc837dd7dc7a64e2fef00b3f7ada52ec0714
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage download or redirection scheme. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to leverage SEO or phishing lures to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e330606ed40---kadidajuzi.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9577eaaf2e---94434861653.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7683d3aea---83848628583.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f77f04d9a5924b006253eb5e3a13981a/63396755738.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddca33afe---28232923862.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/bovurefas.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/iv0ek72ckfmauj8gbad5uh2v24/vakejikumofofusidej.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/46152710809.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/48379778362.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/kuwefekadumorot.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/temunowib.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5bf9c70bc223fe3fda69ee9cfd964670/79240046359.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d8e0be5f---fijavisamefumogolo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d608e9cb3b08629e376e4cb0ef8ad403/18850115027.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/36a7a08abfa9aeab5559ecd141c2f498/widowegujupusa.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/38269594784.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081247a74385---patebaferinivogel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d728aaad54---fizejidunuxetikofagi.pdfIn PDF document text
    • http://asfalon.com/__files/file/74916763043.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/91581350976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+make+a+dog+bed+in+minecraftPDF 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_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 18048 bytes
SHA-256: 81613ece4a55d9bafae8b4d1c8f51b3a75d0f80780ed3841b815312bb0103963
font_01_sfnt_off00013a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 11128 bytes
SHA-256: 5f84a38dcc90c893e81d866efb49014fed5661b503b652c90494ad100d848f6f
font_02_sfnt_off000153e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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