Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf097b0c51651b0b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 04:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd74d44107a77caec07cd3f6fb5ba4aa SHA-1: f8a709da74db8a3d92d62566343a7d1986ca5c9b SHA-256: bf097b0c51651b0be9dfafb859db33d902fcb3cd17b9da6741019a8c6333e44c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only design and embedded links pointing to potentially compromised websites. Heuristics indicate it's a link farm on disposable hosting, designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to facilitate further compromise through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 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://coretry.ru/uplcv?utm_term=english+book+pdf PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16146d1f49129a---80830217310.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kubelavone.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb24d57ad---kabunanoxer.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/14777515388.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/kizusoxerulijonisijotojo.pdfIn PDF document text
    • https://rais.bg/uploads/file/85116735279.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/22742146667.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/91088366727.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/towapizi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1e566eb80a2e58dad8092172178a8f19/86971841779.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/munokedeforupax.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1505e85c2a9b2ffe66ad60eb8b9b204b/49470313598.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/38377137814.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/73254218976.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455f52e1c06---suzutoxute.pdfIn PDF document text
    • https://matricula.arendic.cl/files/86763136577.pdfIn PDF document text
    • http://grotech.in/userfiles/file/13676335467.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/sazegabadibud.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/49405981721.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/gixezuwaka.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/fudepelubu.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/moninibitupoxozifuvolo.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/fepazefim.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_off0000b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 14148 bytes
SHA-256: 7b2452d1fdc86eb70278d8e7cec9ade4001adc4650de7a767e6faeb91d74fd0b
font_01_sfnt_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 10500 bytes
SHA-256: 3197534a86fba364db32d8e6ec9af3976463566057a8433f69151c21cbcd7ab6
font_02_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1