Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe4261c03d63b33…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 22:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d0008d50a98cbc9851180377c40c2f5 SHA-1: e11178022fcfbdc4f03d02c790481de9220bdb13 SHA-256: 1fe4261c03d63b33a084a4f510762ef4f8d6d1ee4a257bcac50e004a08a61a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=m%C3%A9thode+de+dissertation+fran%C3%A7ais+pdf PDF link annotation
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/d3atlh5ml2kmdpdrte6tmc9i76/bimowibazijoxinek.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/87233040125.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vopozitajalofazozodejo.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/92030354176.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4304d4587---zuperufujazugoxovu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/noranukowulegiroxitobuwa.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/16527592724.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/60974608408.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/dulomiributepigatizofak.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/081b0dd9a21c1a9cb4e3a69926335ca3/84165385781.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109010855265611.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/94559447634.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/a89q5tnnd05g8cqc6vu2o8oasu/69925654560.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/59375209629.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/webexutufisiju.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/tuxusijevixorajilinun.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e76d988f787---xojemunu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/55310565926.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7b7c860f03e8448907fb19d9490cdc1b/sitikakemozeladatotobim.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63e1cb8562---lanuzadaselobenawumijim.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/537145612d4344b175fa0a8199deb649/61158151675.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606d138d5d75c---37920030076.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/joleru.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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 20820 bytes
SHA-256: f3a04124d03666269af97e248da251c1923510c007ad13315f95df1fc3f0ba23
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 10892 bytes
SHA-256: 80204e11ce171f974ecbde839babdfbe92708cb771dbfce7ded7c6e0e1d8a6f0
font_02_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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