Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd13716b4bbb742d…

MALICIOUS

PDF

86.1 KB Created: 2021-08-05 14:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc1a0cf205ee347291c4bd2eeed24a70 SHA-1: bb7b2f8fb76efb8b60eb2c717f54db6800b1f544 SHA-256: dd13716b4bbb742d52fe063c5ae608c5b5cddeda6a0b5e171b2152bb3eec1083
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many hosted on compromised CMS uploads and disposable domains, forming a link farm. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ea7e80507---gonitiwidetel.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/67751136990.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/53341ca27b8aebe00422b3565cbb4aef/43632356866.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/40822d238b708f52d5dd54284ff8fd47/guzuxewi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/csnsv894sncgsje9krbcek3n2c/32485800482.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/dujujewuxenivow.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/96596215100.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/rasusirilatoluwikibaxam.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc34e0b1a61---sisajuninijowarutisitijav.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1d62c17bc783d7ca37acacfdfd8ec29d/98807050436.pdfIn PDF document text
    • https://kildevangen.dk/files/xusoridegifip.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94fd6cc8f---ninobowiwe.pdfIn PDF document text
    • https://dhesient.com/media/bokalopagogesuviv.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/53691269593.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb3da699f---21910302211.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a9203e863---25611087113.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/71667568480.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nubupopagopijedibe.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1365a1e196---gazonadijuwef.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc523a71d5b---nuvadederasabupazejuzi.pdfIn PDF document text
    • http://www.fotoliIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+put+sepia+effect+in+photoshopPDF 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 10608 bytes
SHA-256: 5d774e2265674a0acbf8e209bd1d3d3276a6ba3fb13096226a826b963a2a205f
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 17356 bytes
SHA-256: a88fa14b5c3b279afb45551e08baaf995b3f15b636d311749570cebda7ccb21c
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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