Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a62b964533b5f8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 03:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32889043dc2d8dd65e71ccad4a4d98b0 SHA-1: 0426dfb4877f2f0f4336b68bf358e26ca12d64d1 SHA-256: 14a62b964533b5f8089d039a0e19c55dd16da3d8e1b0f883d180169aa8f8ea2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to compromised websites hosting further malicious content, likely to download a second-stage payload. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attempt disguised as a tutorial.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb8e6bc041---14468653957.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a60b05ff7af10cac07c7b68d099b75a0/17492077027.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/zifesaf.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/11774407782.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/fa8a01959f7c0f056c4d74bd327e9873/69150690481.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/39753165486.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/82395774906.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91b4f0603---bizofejozazubej.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/17414061779.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/dufonutogonekeg.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6efc910925f1e2c35c8b3d2241b1319e/nasumekirune.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce11266da---xavidixatojeru.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/komiramexevaxiwomawad.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-2/20210902090523726263.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/41333640728.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/68651560439.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pizumupuduzolomoremo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b620db5c1---707139658.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1e3dc5cbf5---18608387115.pdfIn PDF document text
    • https://citronel.com/userfiles/files/gonemukinijov.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/fisubirexipuvum.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/xemezenodobedirudasegow.pdfIn PDF document text
    • https://kultmotor.hu/images/files/4034115685.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/litiziruzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=photoshop+cs5+tools+tutorial+pdfPDF 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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 10716 bytes
SHA-256: 880f6cdebfbfe64a92914784ac96e0c2380373a5de8fd370b5a809c3b0dfb8d1
font_02_sfnt_off00010ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE5 17432 bytes
SHA-256: 10f9429d65c070a0f1af9d7dd2584777770b370d3a7c556e90ceace9a2381369

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