Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f9807600329f58…

MALICIOUS

PDF

84.7 KB Created: 2021-06-25 21:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 261dce803dcbb75b1da0a5e5fa9b52d3 SHA-1: 43e559479fd04a6ef990c0329bc18b729bea7d41 SHA-256: b1f9807600329f583fa5a8344b4301316f28dbed533710d35acee38176b29bad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links are likely intended to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c898f10e0f1---belejipawurof.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608035ee326d4---25429175308.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20459bdd2---37108536404.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a34099e82---xuvew.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad58690852---46469971767.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/nifegowiwabud.pdf
    • http://businessvaluationapp.com//fck_files/file/53627040754.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cecb93b599a6c98f5c428d1fba9f88fe/jimezofapilinew.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3462b56e3---ginelomukifubemapeniv.pdf
    • http://angarakshaksecurity.com/userfiles/file/xijokotixazob.pdf
    • http://lorichphoto.com/pictures/file/jexitunujisaval.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8c4416ce0f0d0354cc3c62801208384/31601426762.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/78e175358da2d7374ef4adeebd80cd4f/muduzipuxok.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/l1ids9uf7al8mc7srbh0keutt3/36856395746.pdf
    • http://murielbellhomes.com/userfiles/files/88729070476.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5e0ae161f2890cab736605acabc5840f/76039938700.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb07306e7f---fumitomimufukenisev.pdf
    • http://legalinet.eu/userfiles/files/befegobasikufeneruluner.pdf
    • http://rogersdesignhouse.com/uploads/files/mogupovibu.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fb2bf0dd---34622926609.pdf
    • https://communeouchamps.fr/userfiles/file/54379107919.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498a8576bb---jepifulurolag.pdf
    • http://global-leasing-management.com/uf/file/14405291208.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+printable+weekly+calendar+with+30+minute+time+slots
    • 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_off0000e6fa.bin
1224882bdac2d083feff45858234a1b681bdfaf6dce080f5ff07462ea960f921
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 11584 bytes
font_01_sfnt_off00010221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 16792 bytes
font_02_sfnt_off00011a33.bin
2d34f0561c24c221ed8196238d6640df087bffe42bc3090850ea27adbeb4a9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16536 bytes