Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f685985958437d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20dad6f5d9abb19ce98f4b0d21f7fb56 SHA-1: fe248dfe485c31b1d05133a5d82afecada609470 SHA-256: 88f685985958437d8f60478d9e59a8a880f469c314967232819074db42b61554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The embedded URLs suggest an attempt to manipulate search engine results or direct users to potentially malicious content. No scripts were extracted, but the nature of the link farm and the detection results indicate a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c89f45647b1b5c13511290492a5f2878/27514052355.pdf In PDF document text
    • http://baominhlabors.com/upload/files/bilomawuzis.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210821233506.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/46744644380.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/vageduwegepifig.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/53226574783.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/11359801068.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820bf3e0f23---tibuxufo.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fubidap.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/055a7d0fa01f502c39414cbb8c51e6d5/56755802692.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609842605dd70---23738100810.pdfIn PDF document text
    • http://placc.info/up_image/47185161849.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a6e0dab48---41663402288.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/57279708238.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/85489276074.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621110053.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/23494600489.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a291b50d---judimoj.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/88286264711.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/051a58c6d32ada90734ea95426654533/fuxutugulevogi.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/kimitovato.pdfIn PDF document text
    • http://kalikraft.com/images/file/24402215284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=remedy+for+bloated+stomach+after+miscarriagePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 11116 bytes
SHA-256: 34fbfad914d112cfc7d4611535c8c374c0f36489c4fd99b73cec387e9dbcd879
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 17888 bytes
SHA-256: 6f2e7757e70b3598165c3980d97e1aa58b5b8148a2531e35643ed1e274eab655
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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