Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89f03c2f78be86b…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 02:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fca5d325182af7f0cb30fb36f79c0ed3 SHA-1: 1684ff55e41a04f814ecf0190c5eac9181a4c399 SHA-256: d89f03c2f78be86bc8f509a5822ae19c2d02f2d7ab21ae3229022f9d2f6b46cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple URLs hosted on compromised CMS upload directories further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=long+haired+white+german+shepherd+puppies+for+sale PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f13il9q7e66gmmil78jnvfcaf1/geseberiba.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/14vhc39mn0gbp3msalbq83ugb3/newowan.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/34657880064.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870eeea6787---nodiduru.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gazitifesidexanafixugozo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160744ae531385---45758180981.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2a82ba6e---91726129589.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a1beb542fa79a118bfd96d4c9323335d/46188785316.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/wikegesotupemav.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/463588454b7dbf9986358b2b45f669d6/xegenuvuz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8b2fb9aa3a7cd982c3fa4383b1685cc8/zafaxuxawexo.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/17835126388.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/tawugesiremib.pdfIn PDF document text
    • https://bursac.net/userfiles/file/83327720882.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wadubev.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b87fc3c5c1b---rixaforejode.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/97794988637.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/48952799392.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/17348229831.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/25062503206.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1cfcfb865b241d8c54e6d43aa7f78874/lisiruvowu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/81431638118.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_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16876 bytes
SHA-256: 88910114057b4ac7e2166d6389da804247f662fdbd289010306cfa9ae8308526
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 11088 bytes
SHA-256: 8119105bef6e5461e6c7f94d2621db673a53146d65e28f0d246c6649e1ff12f5

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