Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8d4683d160595b…

MALICIOUS

PDF

81.4 KB Created: 2021-07-02 12:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5b7f55fcb38c80c606df629b7e19da SHA-1: 53ee4e06661083ffe236aff8371870da93aa6277 SHA-256: 7c8d4683d160595bfc04bbb6b636d64a6729ea5071d093772c8e931933be5a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, including those hosted on disposable domains. The embedded URLs suggest an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/87084771268.pdf
    • https://vildmarksjagt.dk/userfiles/file/62590546820.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2fdeb698eea595167551c791be686215/tapaxidejimux.pdf
    • http://thermogroup.ru/uploads/files/fitiwesuraninomig.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ekr8bh5cc4dgercl18hc37humh/90434995408.pdf
    • http://uptownchantilly.com/uploads/files/97495605859.pdf
    • http://digitalpolicycouncil.com/imagenes/file/kapulivunumepejutaxo.pdf
    • http://zwickerfoto.hu/_user/file/jumajawivepajinoferetab.pdf
    • http://marymo.ru/uploads/files/toxakiloz.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a12aa8c86---sanegugotavumadodeseji.pdf
    • https://aucordechasse.fr/vosImages/movixatowefemibelexule.pdf
    • http://rollfactorytogo.com/uploads/files/93039370642.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/adu3mn2nevaesfh1m5qsrgi81d/91634224649.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608deca2a456b---37940804675.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8b09cf306ee1b3cb834475307b3a45f9/73673128355.pdf
    • https://oversaslogistica.it/file/38627719490.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/597e20a5f0c6823dec74e1a56eb7c363/kenadorusejan.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/660050bb29b1547e45095ab2f0ab1d3a/pitupegejifanolawele.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af8291010da---18259369306.pdf
    • http://mygiftltd.com/userfiles/file/41539192004.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c85b7d3c4d4b002d199fbe0b48ab1d9f/famaromosededalitovugibeg.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/pazesilugadelazag.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/cb73ba0a42bb1e6116a6b3e212452055/17138842035.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=blue+cheese+dressing+recipe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc48.bin
972231404894b79ff0a355bd180e6709ab9f90f71c6a9f57efb256d8a2e8cc53
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 17112 bytes
font_01_sfnt_off000108bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 16792 bytes
font_02_sfnt_off000120d4.bin
96d9fbd107d004c16958a83359e2806fd00c8bac825efd0ec329c02e684e4165
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 10564 bytes