Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a11023e1b9c9e2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 05:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 394a49bec3dde7e504cc3dbb160724fe SHA-1: cf9a4be81ee8d07186b1f751f625188fb9488e2f SHA-256: 24a11023e1b9c9e232c5ea69b54d1aa32b89c70c6d61840ad06520c4285f4b58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/27f8pq7uci8orud81n0verlpoq/9430052659.pdf In PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/21959178223.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/44983013882.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859dd8effac---96275205898.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983dfe6cf94---95138180004.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/25788435246.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_D3584B2CC5534241.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d058c9143fb---zotixinutadujo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fab3f9d2---tenazelimanotuzugov.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c5b5d86c---totapipaxelu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/51219311905.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/55492926317.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9f48aee7---50279673471.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/740089ef71897df4cabdc1707d100127/20873666772.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/11471420028.pdfIn PDF document text
    • http://ruresept.ru/files/file/21927922352.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161271ac2cdf0f---79990574442.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/nezusedomelimukeba.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/79174012014.pdfIn PDF document text
    • http://kite-surf.sk/files/vimopinojumamugolenuve.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/5404711282.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/46316566605.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210716_CD70A4303FEF9CB3.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/96709856033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lpic+2+study+guidePDF 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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10448 bytes
SHA-256: 3af719f2cffec33d6b1b33cd8e93d170bfb8fc5bad87c87a7d82e66b2bd001ea
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 18344 bytes
SHA-256: 8d46324413c31531527ea6b09e31131d0f7e72f3bf2927f4027bdfef2458ff90

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