Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7bfe8b85cb249e…

MALICIOUS

PDF

77.7 KB Created: 2021-07-31 15:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88e0b6dd12ab429e018b0b6bc0c08d98 SHA-1: b7bda794adecfe42e3b24d9d91c86c58f46aa99c SHA-256: 9d7bfe8b85cb249eed93d182b5487252ac5883fe4d5db1163794a8f3b96ebedf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm patterns strongly suggests this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hkbroadwin.com/userfiles/senuvine.pdf In PDF document text
    • http://teraval.cz/res/file/60222650168.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a341065614b---tilox.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/7288024307.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65edb1de932a3c3d9b31aac0d92d31f7/sufofaxevuweze.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/edcc79777bfca6417b673fac46422722/72401871216.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/89953533110.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/lekenokufigobo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9b08162228033b09bf1a0ae15113a62e/luxipivodol.pdfIn PDF document text
    • http://decalvanphong.com/img_duhoc/files/guzajuxirev.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xorejowanini.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f532ab0b---paxozitu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/45441345530.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/46881780990.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///78278641292.pdfIn PDF document text
    • http://smartmedia.ro/app/webroot/files/userfiles/files/zijunebekag.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5d9b681a0705399239bc2003794e09df/sumezopowozavi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6ae8e504d168327c647ed310ff568235/boponewujimax.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ddde8a4f---50330723206.pdfIn PDF document text
    • http://mvhs78.com/clients/68382/File/debodetetewewog.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqt0shr3ajbjptqfi58l8inku1/netilajila.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kivineneguwabofajojabawev.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc77c96bcb9c6bb83b5321b07d4bb/6682969105.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/baf28df7aaf0eec637d9f101c769dda8/xubuwota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=weather+and+seasons+worksheetsPDF 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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 16500 bytes
SHA-256: 45251e25b43bbea667b5b1c92b09a7aed6cde85af214ec5da3920d2aa26a2db7
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 10380 bytes
SHA-256: cf218b28788a09ac0301d821248c02ffd8da767a07d83ac3446fb5cb66588687
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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