Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8a713fc2edf1ef…

MALICIOUS

PDF

110.0 KB Created: 2021-07-20 09:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbe139d72cb5312a82a8ea5849a8b426 SHA-1: 8e1b723521cf420c0c96c139bd94de19191832c5 SHA-256: 4d8a713fc2edf1ef0cef55dda084544a4c03c176ebdb0a702e0b9690df4458f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. This suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a21b8ed7e---vejekiwakedefolifuxo.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee97edaf8---92222586633.pdf
    • http://mp-journal.com/media/file/rakumametubukase.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b08e96cc8---sikisabubitizakoti.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/35424843306.pdf
    • https://fratellifurloni.it/file/fedukixod.pdf
    • http://hondatayho.top/img-ngocbao/files/15069306433.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a539892d47e---tapasasevobufasexe.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/74a84024ac8d330ad0ec080fbe1cec87/87386448840.pdf
    • https://stiff.pl/ckfinder/userfiles/files/rolonubetosotomadep.pdf
    • https://activepymes.com/pub/file/nadenod.pdf
    • https://alakharia.com/public_html/userfiles/file/78501313934.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/896e9f9327859dc046c2734548c8d4b5/86348344868.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/cc5628dnaaghskjv5a1ri2eq76/44655903183.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad5dadc09---kajeboxutedadukuv.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53540e06c3---63438166947.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772be453f9---17680944988.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bd03a75ac---18811930926.pdf
    • http://atenngo.com/admin/sites/site/documents/jitaf.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/vuxepir.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/aer7lji67ujibgohefeibj8fp7/xogunofupewopawud.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3eb9ea7b66---dejubibibovosopovud.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wuguninel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=geneology+of+adam+and+eve
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013245.bin
b4e1bb6e814c8e901e0c4be3215c7404c88e8708587d9c5da604eda63cd34c98
pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 10460 bytes
font_01_sfnt_off000149e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149E2 16792 bytes
font_02_sfnt_off000161f4.bin
3a88290ce22987b252d2ad8e395ede39dd138d8f501d3c5cda739f6338d59dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x161F4 18196 bytes
font_03_sfnt_off000191ca.bin
9ad922710251147886d26ce3b78cdb0bf1aeabc04ce53e679405a05b042eb279
pdf-font-stream PDF embedded font (sfnt) at offset 0x191CA 16984 bytes