Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f4f2291cdbae03…

MALICIOUS

PDF

69.8 KB Created: 2021-08-30 03:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b35fb47936bb40068cd676bce8c36e55 SHA-1: d304390fd62bc3ece13939091243025ea4008a53 SHA-256: 25f4f2291cdbae03f5b451c3c03fc30e6a38d9f2e4c0d4c092b32c72c4a19abc
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pressvaluation.net/userfiles/file/kajomi.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078e083b96be---fojulasotuzukododosuzozud.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59b5993ef---40603176215.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/70310551938.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kbt4e74shf7p51r8jhr9s26c44/busexegijuwo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e402372f---7903206236.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/32171548259.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/tirazepogoxok.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/8549133407.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70173926444.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ad6d4840---puzixetoboza.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/galosaxirifeluwufiwi.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/tomawobiximoxow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc2ce9e8de---lajipologas.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/43007808323.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c5cb29671---67727774227.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/95515005479.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/rerorofejovukotikubem.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210701054526.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc353bb4d---gojoresadafumotivat.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c51607a2---xebiruwetofibapizotip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+cooked+chicken+bad+for+dogsPDF 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_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 15000 bytes
SHA-256: 6991ec27fbfc725d41783afad12c02e239b6c94d3d8c36b06b6dd227f7bf3e3f
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 10792 bytes
SHA-256: 003bde19a2b8748d3eb649e38123fe206b0e00d4f1623fb26b1a9d4f53f26243

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