Malicious PDF — malware analysis report

Static analysis result for SHA-256 4750c0baa6619c22…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 00:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35e0d36a48eca75b602b6a3fa69dc384 SHA-1: 10ec1009c35c01e85d4b95f1cdd97ce936eb87e8 SHA-256: 4750c0baa6619c226b7278a0045d0849a82ee3cc575bf0e6dfa85ec60975d2b2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or further stages of an attack. No scripts were extracted from this sample, but the presence of multiple compromised links strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4e47e5e0---nafepim.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/eda77ee05a90da2e548f41456dc1292c/sasipajunabowuv.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c4ce9e470a8b0dfc02113fece8184af9/gotojakawilabigezon.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623f38d72e---42761942822.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c3795eed---39671738369.pdf
    • http://alnadaoil.com/userfiles/file/lofizafovusalozuviropig.pdf
    • http://stellar.ru/ckfinder/userfiles/files/serorezudenenoru.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072047b5119c---dadiginufa.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/n8a29d8oqeohn3v5abl093rei1/76488361460.pdf
    • http://augustaelectricalwork.com/editorData/file/33276394971.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5254e13f---tanigatobu.pdf
    • http://uptownchantilly.com/uploads/files/detabefawigik.pdf
    • http://progfin.pl/userfiles/file/31642966712.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/og24j7qbq6osuqlubsdn9pkvmb/rasizek.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8709e103---daxakusa.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef7d8461e---xeduwoxisid.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3657441447d7fcbd67f506455f09ee58/sisuxodu.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d6e0d1a7b2a264c63b5191dfe82038a0/zimetuforevuzusisar.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/52334pmc1b0esgurgc4ecuef7s/sififabuzaxata.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977d29c8e0---bopikinatoxira.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/961d809bc72e444255e49f9bed704d5c/83087462096.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cartoon+network+punch+time+explosion+2
    • 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_off0000f0ff.bin
545d5426ba0b66e6f681db9189c75c08ed826df408aa1fc442bf75995aad9b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 11168 bytes
font_01_sfnt_off00010b0d.bin
5acb1040b9173d3c5b2eb06da751d09ea1025202071454a692797232c6f7007b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 16692 bytes
font_02_sfnt_off0001368a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 16792 bytes