Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ac869201d36994…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 06:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8e741bfb6268676f68a0bf1a9d238cc SHA-1: c51a6aa40cf085905834dced4c1687c09a7284ab SHA-256: 86ac869201d36994252dc59277226ad99fdc4870c31ad78db9fa05bd274176a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://intervalhousehamilton.org/ckfinder/userfiles/files/91601195475.pdf In PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/61124089760.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/157311d45c07205116fdc893d8f2fb1f/runibebesobilexoli.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec9e46cda---kusikarolizinogunijexenol.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31ea10dbf---zorokis.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sazub.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/87631491262.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71093848951.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/nezositisevinakebiwiboto.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9ots1q8120tel1e8pnlqv700np/gegirilodomus.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/79787391456.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/gimadenefuz.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/24461381581.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/1444818624.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4ln0f5m5sg87cho7142o9j8uf6/sakugalo.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/38055105449.pdfIn PDF document text
    • http://ubranni.com/uploader/files/43362889328.pdfIn PDF document text
    • http://mosjob.ru/images/file/85932794448.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a044e486c17---19944035012.pdfIn PDF document text
    • https://appfacile.it/file/nogovobamoraxikuvupemuli.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074788cde8ef---27400229690.pdfIn PDF document text
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/vurokijotekoruw.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dizovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=iframe+display+pdfPDF 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_off0000c188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 16624 bytes
SHA-256: 7324993e78ef3412dd6002b8b09f170804aaa44658a784cc7ec8becb2dc8eb7d
font_02_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10404 bytes
SHA-256: 7d1751f7b3857ca20aeb7bb7ec9c5c311a53429928715e9b3123ab0f8dc63b33

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