Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9ce8ba6dfd6c0d…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 22:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93e9bce611ef2c2ed93248d325de3625 SHA-1: 560545767c3abbd3984f4f1b3bdd4a576f042e10 SHA-256: de9ce8ba6dfd6c0dbd9fd39a112a0cf72699683ffceae9e98c303c590b4e0734
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to various URLs, some hosted on compromised CMS upload storage. The primary lure appears to be a download for 'god of war ppsspp file download', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=god+of+war+ppsspp+file+download PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a2da02db4c076621c5f402705520c516/fobav.pdfIn PDF document text
    • http://soupworld.de/upload/file/pumozobedu.pdfIn PDF document text
    • http://neteyes.eu/editor_up/79318197488.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/73188690528.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b225547f09721e1e600630e97c0b58d0/69145634193.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210903055225.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/65841770095.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/zudilad.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613172c473a05---gaviwejujebifi.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/sopidowovak.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/dagiwefilenewubiwabuj.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/51086861760.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/gozam.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/26171417087.pdfIn PDF document text
    • http://saint-party.com/media/file/84359473187.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/65307689831.pdfIn PDF document text
    • http://recrute.fr/files/files/44777811559.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109092054368745.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/30701382608.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091006092554.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8e76ce19fc7e810635479c6db8ef2c5b/14828198788.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/95439423229.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_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 17272 bytes
SHA-256: 3f9e8b7da26643e44a4f7dff0c23bdf420c6e904e12b650267cd495d12cc3985
font_02_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 10516 bytes
SHA-256: 2ab7d32b10daaee05f702bf7ac4cddfd819bd8d9c93b6acb31fcf6d285276d74