Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7441496dd6a155…

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 03:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3784a30f4d7a6636cef1dde7d00a219f SHA-1: df6bc8218885fa64a9920e22035cd5f6fc357cc9 SHA-256: 6b7441496dd6a1553cdee5a7da4d0aca47cb8e5905c65bb4c72309f5afa1a13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://changrung.com/ckfinder/userfiles/files/23477012876.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160853d2aa004c---75971109336.pdf
    • https://aradovan.com/userfiles/file/8051107612.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/17734934356.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d61aa3c6---4676327956.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ad6885bc6---96242936961.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160be64b7b93be---furibalefivatenogenin.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ac9ba921d72f102c312314c363583997/60108593532.pdf
    • http://nowyhotelik.pl/userfiles/file/bajiloletufizavid.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd65cd6e3---83621532056.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e20e395e---jamuwizuna.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j8r51vogd4d3cqtm2p1vsnglc6/dozowipelesusomo.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160741c1f2ead8---62953058565.pdf
    • https://suprizpin.com/calisma2/files/uploads/28457717882.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051584855_945877472.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076ceb635bbb---79888733455.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2d76ada95---suxamilarezas.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb214a495d---kipikabuwiwofibiboni.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/48616211373d97cf77d7558609e37c22/76847712115.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160969d964c53d---fatapifanifedal.pdf
    • http://bajajsports.com/userfiles/file/nazoduduzumugezix.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078707595df6---morevugotofe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=intermediate+2nd+year+physics+important+questions+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb0.bin
09562ca2d5000ae2f2345c4ffb282664df80e6add20478162cc85c395b82892d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16120 bytes
font_01_sfnt_off00010109.bin
81b4044bf3645b7d15e6aeaae90642062133c7269f1b1ba37a823f391d94219f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 11268 bytes
font_02_sfnt_off00011b2a.bin
0fec8f2a1c9a9cbc6002635fffc6f512215b099a9f2d97297effac28f36dc0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 17332 bytes
font_03_sfnt_off0001482d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1482D 16792 bytes

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