Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd91c011b311b7a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 15:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00a879dca851c9c214e500251ad97f99 SHA-1: 3215494f02d6d7c64e948c1695db7f7721649c73 SHA-256: 4bd91c011b311b7a2c0549d5a3d688b2bc79c47961be3e980f5783ccfe6d76c1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a spearphishing campaign designed to redirect users to malicious content.

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 https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ad4525b147aacf8527c41c9b4424a435/xesavala.pdf In PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/49385163262.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/af7800a3084a2516e6e0c12722d796a5/99156029017.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b58466ddf---71550308295.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/samijami.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3674f23b94adf4444bbc9ef463200dfe/76366598873.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb970b38dc---ligipiforuvisifipet.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/118968913760dd8570436e9.pdfIn PDF document text
    • http://ankarapianofestival.com/userfiles/file/dezisevufibisupimebozil.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/pitupuj.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dd570074c59497b131d987e95d267ef8/55352141669.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/32338751598.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421d5ee715---bagidijokoxasemom.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/dabarixosuja.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/2q6ci9a1nu985hoasu3o6sps6a/78884797919.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ade32438f24---95187034176.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/jetoxomidoloxobijogunob.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kp1ovuf77qlpbg41kftrmaq594/zumagikatoralezasud.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607903cb6e4d0---75422431032.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/27089907726.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/91777364789.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3440037566b4df10160f19b928ea6a45/ribumitavikof.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/5352803905.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6e4a164093a2178a8bc4e93e95cb3f9f/99083158227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hard+riddles+for+teens+with+answersPDF 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 17804 bytes
SHA-256: 30c984b595a7fc671ecc201e2dca0e1fbf6cb6c3f4ac0a38330adc3b9e580fe0
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 10528 bytes
SHA-256: 680721520a63951d1d11abc7091b5b82c9e3b75c97714489ab2b698c4e663c3d
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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