Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b61fcf5246483a…

MALICIOUS

PDF

70.6 KB Created: 2021-07-02 02:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b692e607fc01538fae2116a1ae11ac94 SHA-1: af5e6bcb1b1e5a83780e52806a5dfef1998a03bb SHA-256: 11b61fcf5246483a68b34625d5c6658f0ef340e9cec795840f404b5e83fac49f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are designed to evade detection. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95dd134ae8---21150437430.pdf
    • https://privatecambodiatour.com/userfiles/file/15224623063.pdf
    • http://hopsch.de/uploads/file/14897158909.pdf
    • http://slanfusa.org/clients/47225/File/38565223227.pdf
    • http://lorichphoto.com/pictures/file/litavoruwoxividupisizutiv.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/670ff957caec92df0945652134a4e5aa/96303283497.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcf9164e063f68db7e38fb1936cefca1/libetofetozaf.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca6ab14ee---bikefepeku.pdf
    • http://angarakshaksecurity.com/userfiles/file/zeruf.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f7a91501ce8285442c8e716d0af773f5/88364627999.pdf
    • https://gomaihoa.net/upload/files/kedepudinokipibodunal.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/0a28d5c681ccda15860c527f70635567/gozamodor.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608687cb65960---kepebakovegu.pdf
    • http://4seasonstours.in/userfiles/file/25166603246.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacd573552---20233118093.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865427a594---lewidumoxokekitumokasa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8190f3ae95b37cae9449326f49b1bf95/firebavometuxunivemuki.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210620_0FD34302AE5E7A8D.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/41378301092.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97830dba02---jagiw.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/55956afaaf91d6071761a00c63cfa584/1831373253.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=66f+act+answers
    • 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_off0000b5b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 16792 bytes
font_01_sfnt_off0000cdc7.bin
0e55dbcf0182a1c03a9e2292909a493ee1a3a7e50f604b3c7d8d451327357c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 15812 bytes
font_02_sfnt_off0000f65d.bin
cf1f834de90389b06b0ac35c2932ab3adb69e25471ecd88c7ff38402bd668621
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 10228 bytes