Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3181caa080c532…

MALICIOUS

PDF

67.2 KB Created: 2021-10-02 21:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d779e0df259aa1ceb15d3b2b2aba0b83 SHA-1: 685e60d75ef4db06f5ac77fb665ad40887320401 SHA-256: 7d3181caa080c532b43bd58a0fa3af6856ae798a221cb6c04946a0d3a1ce813e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only document designed as a lure, containing numerous links to external sites, many hosted on compromised WordPress installations. The presence of multiple distinct hosts and UTM parameters suggests a phishing campaign or a link farm for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=average+size+of+a+great+white+shark PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131663d5e959---6602228700.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/83666285342.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/33981355082.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20809daa9---libosujot.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/16990163053.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338fd9c0b1f---nokusasavotizamikolikikul.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/xidijexugoten.pdfIn PDF document text
    • https://upaspor.com/resimler/files/tadozaboxagilememurejin.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210922171939.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/geduvigenokinujuzunok.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/37652703122.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/tazusubozupitus.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091113482924529.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/28186252783.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/22144887384.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/liradamulugijumerol.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/24400474208.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/26725696974.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/geriwotibupom.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/vixepokoribegidolesuzitel.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3faeadfad---bapipeni.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_off0000abd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD3 14136 bytes
SHA-256: 6a9cbd26e433f2b459dfd6d741be4f1ffabb067c53c00ade901933d1627dbe6e
font_01_sfnt_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 10628 bytes
SHA-256: 4bcb626520f3a38e126f4503d9e535257b5faa29a6e855b71e4836b859eb7afe
font_02_sfnt_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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