Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d058f3e247558e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 05:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ec7e2f4c0c24c457501412081b5e45a SHA-1: f8ba9dc66de607d91af021a3a3b89dac2fd223ec SHA-256: d6d058f3e247558e1760d79fd3558e91c6d85bb75109e63982ef1a44066277f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate it is likely part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://krisoc.ru/uplcv?utm_term=le+paludisme+causes+consequences+et+solutions+pdf PDF link annotation
    • http://shethof.ch/cgi-bin/dynamisch/file/fizirutukigulireval.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fa7984b2---3392094136.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088551d4b836---21274446369.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210718163535_1mp9f7.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fe0cb7d2cca00ef216650a6f47299542/gawesuzutibexisejimazu.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/tufivevomunid.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a9294bb13---bopapulufigejalavuj.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b8523bdd294f1ddf28f7c7389cf19917/10125758943.pdfIn PDF document text
    • http://momsystem.ru/public/file/71103463194.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/gizajipuworop.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/48366939341.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/36471986412.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/navalowi.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/12362563283.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/67c9d363a27585838f1031e6de57efd3/noxufofitu.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/92418690483.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210512180435.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7d52561a---35835947698.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/c55f99c2d6f5a0036042fab9eb90d45b/ruvokirij.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/sefikowe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/150142002803.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/61802410452.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/wipipobulixaluwasuj.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/sapomog.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/1rt9fjs7qpmep371ecj2g84tgi/22541557508.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/nimeboruj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/106da36ea4fcf8498ca6122730b69c97/debofukifikoguzap.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l2it5cbaakd92o53d0n6a45et6/55934531769.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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 18480 bytes
SHA-256: 21d815b90253c99001d7597fbe65db336463d4dfa87b49878cac583a6ffddd5a
font_01_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 10884 bytes
SHA-256: 9c9781a22a3ff532e113caac1be16c4e67fa542429e6f23126c52dceb541b2c2

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