Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b6b34ded7803c4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 930c1c55cce794af37aa1073ec2a5d7c SHA-1: dc47beea4c1ac38d031e2815be024dc13faeb477 SHA-256: 79b6b34ded7803c4b76a3be9c565bcecd86e643de8e96138f594e0da2173c981
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The presence of a link farm on disposable hosting further supports a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://greenbrier101.com/userimages/6956209583.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8d2ad9520cdf8fe302d9c1dad88be651/fasodi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083881725859---widekoxujiribonerodegokej.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/gemaxewikadezukuwikafubaf.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/renll3cu7imv0ofhpmmmn3kb31/juxitelidot.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/10575954018.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/37742917519.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/guvasomupemepemavotoxa.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d43ee0b0---56876869552.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d626a4f9f2044235a1af88f0f1f0411/selepusivaluragog.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/xogivodewori.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a65722caebf72b38fcbf7c80b58d83ec/93183533089.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/82086849436.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/75947139636.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/1494235512.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c106732d45d---10660704852.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nudilogupijolaxatazuka.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/75576934583.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9b5dd7296d0b287403af11f4ceefdbbe/35761843203.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c6dd277b45cdfbd52e08b1f2063fe69/pajinabin.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5e9b9b80d93d68b86731f32997640b6f/41444697334.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080764284a82---80963527850.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/17845696978.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/53296852260.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9ed3b3d56480c601a20386e29763c2dc/tomovovuzegugidig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=drishti+magazine+online+pdfPDF 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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 11004 bytes
SHA-256: 41360ca41ec3c9a3df8026bf05c5044527ad9370a6bf39799fc9d42e80f47cb4
font_01_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 16796 bytes
SHA-256: b98d6b0ce53784d2c93abb7fe415a1b2fc2684ed615ece6a588b83c6b47747b5

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