Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc320a1cbbfdb978…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 23:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 069efbfd158107af766ae10a0e6c6a4c SHA-1: 5142636c6148100cb869a87c6f51dfb06b0879ee SHA-256: fc320a1cbbfdb97842963e9d126fafd5fa8c0c3811b420074f3b86e52ba61971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to potentially malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://icbacademy.com/upload/files/votepabamirag.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3d15e9b0278d6210b144015ffe806809/89398243202.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/q85rcl1lnr95djj8cdg5p5kv5b/nafemazubet.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/06a10284647e41b6e18138b6f239ba81/19932610105.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/83854423453.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5bea7b01---pilunef.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jgniqtd3ilhsbvnk5gbnl77r88/wivefibikusosipona.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba40b01335c---pazujuwe.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/af964eb640b02837ffa174fb50e9c701/92572087350.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3b57c3f3---tuzejefotupanulavelawume.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a847713837---supanobuxelavu.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c436784779f---96528627816.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e407486a2---84362977132.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/36c5f366fc31f9c008e58eb4a65aa028/9310094591.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8968cb7a91---vizefesusewumiwabogakivi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aacc1d285---50571124321.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919b6e5c1d6---kunuzakajeviwe.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/33155c62be17009ed4e47328070a05a0/kogez.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30485a393---midadanatavus.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/19068767785.pdf
    • http://omni-links.com/images/blog//file/38443824185.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/44ae298736ed7bf769433f0fbf5bf031/34641726476.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8583ee299---suxoxokivisur.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed72f0ccb8---5576200189.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=richest+person+of+world+2020
    • 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_off0000ef9c.bin
e695685431bef5d6955b383a124e0351ad55f6a54106dbc9777539caa9d2e237
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10928 bytes
font_01_sfnt_off000108f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 16792 bytes
font_02_sfnt_off00012102.bin
0c3080d409bf5420d75aa5f2257e96ecf556f00a1fff28a4a08b9ca934cef3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 18396 bytes