Malicious PDF — malware analysis report

Static analysis result for SHA-256 575674f41ca89ba5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 21:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0244bd2b38ac60bc04ecb632c88ba8f SHA-1: fbc74212df93bd90246627c9a868d393222e0b3d SHA-256: 575674f41ca89ba51a6652d093ad4b0768ad1f092a2be222384f965154c442b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with spearphishing attachments used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=thoptv+for+fire+tv+stick
    • https://ou-ravda.com/ckfinder/userfiles/files/47000873126.pdf
    • http://ttc-investco.com/img/files/wemegukiwakapi.pdf
    • https://suma.ca/upload/editor/file/xipadoweburetux.pdf
    • https://grouptm2.com/contents/files/risarebet.pdf
    • http://marketingnews.fr/images/file/96318708919.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/90261242620.pdf
    • https://coevent.ru/upload/files/lisirukomibidegedij.pdf
    • http://www.mustwalge.ee/data/content/files/soxurefizun.pdf
    • http://bkdesign.ee/userfiles/file/vipinenirevejonesokeles.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465b281ecc8---21641887067.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/tekobiveguzig.pdf
    • http://ctcinsulator.com/uploads/file/bezemadugolumepip.pdf
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/76329498946.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/10b1fb0485d0b736ddea69d18fa6671f/36769011870.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/743bc4e0ae88a3e52bfad0abff900c88/soxuzerusulu.pdf
    • http://factorycontrolprojects.com/userfiles/file/90219686439.pdf
    • https://immobiliareincentro.it/allegati/file/zidabu.pdf
    • https://nasco-ye.com/uploads/file/32297309776.pdf
    • http://deshdunya.com/blogimage/file/sodexebezor.pdf
    • https://beyondpins.com/calisma2/files/uploads/lopisimujomasuwo.pdf
    • http://taiwan-tsai.com/upload/files/burerasimokidugurodoxow.pdf
    • https://jxlmedu.com/file/files/20210919_150419.pdf
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/ruxadefow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d386.bin
e3fd0e4d735c8a4d37b36f7b0592d1257048d48bd8a9458ec52ab14cb16fc575		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 10384 bytes
font_01_sfnt_off0000eb40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16792 bytes
font_02_sfnt_off00010352.bin
bf440f000d9ec7a566868e7bdaf2ec71572b948474b74cdce1043ea437d470d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 17464 bytes

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