Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e1eff4ba6714e7…

MALICIOUS

PDF

99.5 KB Created: 2021-06-28 04:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0908ff1612f8e7b2bd35716390a19b94 SHA-1: 37a4fc000c0c4f33c3681d4c521d0a4a6738f0b6 SHA-256: b4e1eff4ba6714e767d378ac70ae690087d12f28e295b78fa878f2ba8ce008d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://infrive.ru/uplcv?utm_term=cities+skylines+industries+dlc+guide PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1328653e93---59446574171.pdfIn PDF document text
    • http://rayanchem.com/d/files/toretelakizazudikizuwa.pdfIn PDF document text
    • https://memoservicesrl.it/file/85416796330.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/26192044090.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tomazalefusaxar.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/barujupe.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokezetedak.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884502c51c3---xidinujezifezasetemedosi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c823b3ed---xoranexanudafawejog.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/tipuxo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xexugisili.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/vewigasemegivodiporerub.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/92110883913.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/tagubopijikatefobogi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q4u1tmgbgit5o7q5tpv86g2di4/48255449050.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc3681fc9---zibubelo.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/76799964236.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/59014164086.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/talipurapavuripofapetebew.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/semorowosibutewunu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c69c47d74b0813e4ea3463d4452bc347/59550862973.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d531b871ee---vefeluvevuxizukukekibulap.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/195d54n3ftu4msb5d6j70ock46/lojolinulidix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16224 bytes
SHA-256: 5dc452f2b4f8f6cf50bab96a09d9f243b03113461a4839846761b06a93380fa3
font_01_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 17444 bytes
SHA-256: 0b69194a10382b4a4e4034e0b8b9ec6fb5f208434cb8fce358d1b47aaa397614
font_02_sfnt_off00014f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 10600 bytes
SHA-256: 09357b24f3179cf503763dea74c4a70cf3a4b651f8577d141ef071e18f443629
font_03_sfnt_off000167b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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