Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a56b54d68c31ee8…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 05:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cabc63acf33bd5939524d601f82422d6 SHA-1: f45e96131999d53e0d16afa1d836f1fbdee291be SHA-256: 4a56b54d68c31ee8f990e34881ff3d81d4ef70fd1e919c865fdc49ce04edb485
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=syst%C3%A8me+universitaire+fran%C3%A7ais+pdf PDF link annotation
    • https://ozsersogutma.com/upload/files/butigaganigikexe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035fe91b5e4---68713009457.pdfIn PDF document text
    • http://punaide.com/userfiles/files/90007485317.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119787a864d2---zalufefonujag.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/durekajani.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/vazazevaf.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/07f38446a850c81aae769f1fffe3125d/gatenujut.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1472e7619---fiwosubuxolusutolegi.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16239857341659154393.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/jitijuvavamorogewawelapin.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c4b0c572---41997858300.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/61771457574.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/37485047704.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc54557e073---91283930410.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/30877863826.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/949035150.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/japuzososaval.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/suviwinojesalavuw.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jojebanojag.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086775fc94b3---sagujalovovozowa.pdfIn PDF document text
    • https://go2germany.ru/files/file/20660180826.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/gemogijipavexag.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608101a0e3995---kaxavugaloxexu.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/tokomoda.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 20052 bytes
SHA-256: 141f872d68320c834c697d6a3a9589ec041c2bde1139a39b5a49383f15f05967
font_01_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 11200 bytes
SHA-256: da257b8b2786450531cae1d53aad8a9659474b3b900068acf15395ec63de8a41

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