Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f5cbcced8e76c2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 09:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cae1e9f9a9decd692930cd78be87189 SHA-1: 81d2f4cad4267c4a642d14e9100f6f055c149723 SHA-256: 81f5cbcced8e76c2267bf355d63d65b6faf0f228383da30b617afe399885e7c4
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely lead to phishing pages or further malware downloads.

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133439270fc2---18480882412.pdf In PDF document text
    • http://xnucleus.com/members/member_images/files/48625248568.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/5185681703.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/18283896045.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/95993524672.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/bapepile.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/68091455502.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/lejoxa.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/nufinezubinejojawi.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/wetenunaguji.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/54414667266.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0b89e82a79f602dd30607c9dd0a8aaf2/tutisapelakanekeloditaxef.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/mokejogijalo.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/93061285596.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12886486074.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/87504580744.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/pazejomewewadagepifamome.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132def119e2c---tegixufekofuj.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/bozagewugobowitavudimovek.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/zapemiwinewazavupemoj.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30d287104---tajafuvubejasemazojumeka.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/43129248348.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/54587618642.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/bupenemo.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/xajabusutonabekuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=friends+all+seasons+with+english+subtitlesPDF 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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 10832 bytes
SHA-256: e13d551eafe6fbf98bd190d004df62eac1b89829dfa16a4bd09dffa13c3a7812
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 17640 bytes
SHA-256: 50d846b6ad6c55889d38f98c26864b871138d0176fedf5f44905233b59bdbeb3