Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9e76643606fd97…

MALICIOUS

PDF

88.4 KB Created: 2021-09-04 04:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f8fa71bbea3d34ff4b41a91d16485d3 SHA-1: 8d3f3fad5136c9feca8251430204a02389de7463 SHA-256: 9d9e76643606fd978e0fd85ab02656ac8e1be5f04d12ca25cd301c670ea59fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The presence of ML and ClamAV detections, specifically flagging it as 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The document body is heavily obfuscated and unreadable, but the heuristics and URL analysis point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=bissell+carpet+cleaner+owners+manual PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e062dd7a8c---wujuduvosugugeruxak.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xomat.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942fb0ba37a---33913616356.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f9f1780c---35651328735.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/laneduxetejefukow.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xisetazetizagiwuje.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-13/20210713220150246008.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/841e8c647812aa5c771318ceabfff2d9/zigexajabujele.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/7636622278.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/werokugibekedixoxipi.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/19677592839.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ogo1g7f9in8vs4aitc03l2g11h/tipejofutoxisub.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/6642592045.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad5551fb394988f263207d88d4d00091/3701183362.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/benolupebodiz.pdfIn PDF document text
    • http://protezas.lt/i/File/sogesepomofo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/fomopovepovozibe.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/umij65qj4c1sog2ejavqmqo2h2/telefabem.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3f171c43657b6e4c8862f85fc056bd4b/97606033787.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/50746188306.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/88720374066.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098935ac7097---32622124596.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd831b5d8---zagotunezolir.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/40640202444.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_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 16868 bytes
SHA-256: 645e60f05eb06967372a2c9b5351d08af25f9bf450af8999df649817d4b7d5bd
font_01_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 10772 bytes
SHA-256: 0422051d318a580428f8cd0eec9c0560f47e88c9031a30454d55c586774344b8
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1