Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c164e2e0b98d73…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 03:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c49ba8362d302f44a20b9aca3b1845c SHA-1: b61d0c1fa5701bd837c06b02ef0e3c5b156cdbbd SHA-256: 58c164e2e0b98d7358665e1a7fca48042973953d20101ce3591e4806f71d9c5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=examples+of+eu+directives
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a39b4e4ec---mumibuwivogevifiko.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ada9ae9be---87034163297.pdf
    • http://diysmart.net/userfiles/file/wozumevifepupufi.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q3p01s74liptgkf8b9jtngpvvt/xekowojuzad.pdf
    • http://arcomproltd.com/userfiles/file/lipafe.pdf
    • https://agentcctv.com/userfiles/file/1763518788.pdf
    • http://renknh.com/ckupload/files/36288953269.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugasapojoxe.pdf
    • http://dominoliberec.eu/images/file/files/90137360728.pdf
    • https://guijek.com/userfiles/file/91636707728.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2d8987abae9d7051e32c0e1354b4625f/fotuxujivovupujivulotad.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7025055e91---duniziwarugunomuxododo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee25073f12---55810773750.pdf
    • http://scheidenschiedam.nl/uploads//file/wopizeninolu.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/88864582840.pdf
    • https://angkortaxiservice.com/userfiles/file/kafisi.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e5b5010bf62a614e288b3f3e5ecb8958/69450090912.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df4d9c3d72---20394084580.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vn66djfplbaec2hpvr6s2ei2ft/18417658720.pdf
    • http://stylowa-pss.pl/userfiles/file/dupopututet.pdf
    • http://guojingmall.com/userfiles/file///vifoxegowazukusifuzokegur.pdf
    • http://benrassam.com/uploads/files/sofogewirewewurejoginoj.pdf
    • http://thunderstar.cn/userfiles/file/20210513211459741960129.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bc0af4f1cb9af0b6565354d62a118941/refinefinikuwirosir.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/121dce107ebff400d90bda81baab5e3d/71142242068.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_off0000eac7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
font_01_sfnt_off000102de.bin
59ce4e426a9d06541ac1feccb3bbca31dde1ffaa4e8f8e9f6831fed2e7e8edcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10928 bytes
font_02_sfnt_off00011c3e.bin
fda34c1f3197b1d26a6c37d698b189bdd8f2921fc1b41d6f3a9a3ad8c947ea80
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 17444 bytes