Malicious PDF — malware analysis report

Static analysis result for SHA-256 19adaa0bd431ed62…

MALICIOUS

PDF

78.3 KB Created: 2021-06-25 22:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 586b18a45308e6171ccfa9cf2bb4643a SHA-1: d9a644d14946ea9ecb71bb0a8eacec1fbda3b424 SHA-256: 19adaa0bd431ed626efe96656156530089420551b28bf6510f50f2fc305a34d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778b0cae453---gunufutefipibibumuxakipa.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160901378301b4---goxivowavitamojemazaja.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/olmhp5lln3k9t6muifkvs8p024/xumulunapilokagala.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21a381685---2854886235.pdf
    • http://vietthanhstone.com/images/news/file/63453087078.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a8f427dd37d2a39988438d7b2585f5dc/75450080438.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a21e68544---37611930473.pdf
    • http://applecentervn.com/uploads/image/files/86518308344.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071677ade206---12928787571.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081f92486fc4---gemuvapugoji.pdf
    • http://ahcxdq.com/uploads/file/302244303813.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1vmlb668pj4oaeiivhhjlqo7io/10096697897.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kgik87q1q8m9qc6ujarlvtco4g/zaxuzatikujumupafek.pdf
    • https://taevlingar.se/images/pages/file/5925770105.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099423b9c631---xijukuwotuvelotijufapit.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e214183b---79881123352.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6ab4qdf1su8c1ko2jfkjs8og0e/xelerafadupuj.pdf
    • http://microcement.ua/userfiles/file/5204956939.pdf
    • http://geose.ru/userfiles/file/45389756232.pdf
    • https://btsis.com/upload/ckfinder/files/livoxobuxu.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5f2d1b707b624eaac267167369faee39/42472628647.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=online+hotel+booking+business+plan+pdf
    • 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_off0000d13e.bin
5c64983b34203bed9eb6918ac197d943f22adf3b94ff7dfbc06f2072c452f813
pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 11032 bytes
font_01_sfnt_off0000ea70.bin
b5e8474e58f7aa84cabc037c58bdf5987f50d3d5c0e1fc5b38581789c826e649
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 16196 bytes
font_02_sfnt_off0001143b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 16792 bytes