Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98da8c3855ec8ae…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 00:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0fd63c7ce25a509a887b624d017f7f4 SHA-1: 780609e4e877ad798d4350d8e5bd371ec6bb7c5d SHA-256: b98da8c3855ec8ae71a386d1a03046a4c5f015a7765becf5c353462a07e55509
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI heuristics point towards a malicious document designed to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=subaru+outback+2017+premium+manual PDF link annotation
    • http://bigband-ulm.de/userfiles/files/jejewobotofufud.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/73242905548.pdfIn PDF document text
    • http://chayka-svg.ru/files/ledel.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/97993390530.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/64563095823.pdfPDF link annotation
    • http://weberstellen.ch/userfiles/file/zikemarenixemavu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423f2232ca---86547664173.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/85261818753.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f55e4c8af1c09f894b22f3cf365eb2f0/53555526615.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/xomojekemuzebazepam.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/rabumezidujo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a18643ab53---fodajekosowig.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ev3fr7eks1kkke86gdhjn814bb/dolodejejivakowagubuwi.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/14585687281.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0dc0e7bae---38473602311.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851abfeffc9---60139629517.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/38475662189.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70595561892.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/dezurorafe.pdfIn PDF document text
    • http://wp-kancelaria.com/userfiles/file/54564375171.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/21946132636.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b09e97ce87---nadapozitobeno.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/1a6ec1fb01a3ff7fc41a3f2b66ce0df5/58687847004.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4b87e4dc---8590871339.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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 17372 bytes
SHA-256: 7fc3c5f1ccc659536a51a4a78a1a2a8a0020dd3f7b29cc562c4a3e99d746c98f
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 11116 bytes
SHA-256: e63817401d639b1ecbab2c6b4c5bfc381c2e332e4c56e592230e1bca1890d615

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