Malicious PDF — malware analysis report

Static analysis result for SHA-256 5037b1da54c9e1e8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 11:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b023c2df9aa96f0e5fae9453c92e294b SHA-1: 3e81bc50ab4982568260ed72afee91a6e680822c SHA-256: 5037b1da54c9e1e8504443ae1cae29d6530fc6d0c423c2793d6fa29c5e034791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=transformers+3d+live+wallpaper PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/88272940346.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b47ce24f64b2c7407b8ebfa86982f84d/zotewelatariremexugoramam.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/35282917706.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/mutobuvojokam.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3311c5f2de62e6ee68078fbc42310bec/37821837017.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142d315b9579---3955446735.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ut2k6fd5qklce36vku0bn7m30/xodemunidositutexaxobejir.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/wenilurafipolazosow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe1fa8ac7---57439715122.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1496a011---ruwafimitanu.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/silelisejokuwiparepij.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/26358046473.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/14998433003.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94541621600.pdfIn PDF document text
    • http://unsersohn.ch/images/file/57050445811.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/54825381291.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/35912978247.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/89300961591.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/gamavul.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/wazerutarogatob.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/vidafa.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/fokobunakinolodexunijogav.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/xononorivadufo.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/feredubewipogekofaz.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/polasiwikowewivu.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/tenalotuk.pdfIn PDF document text
    • 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 10848 bytes
SHA-256: b0cad93e4ae1cf266065e5b5d72a41b96bf83ffac3f5ae39e95e37b5e3e3cad3
font_01_sfnt_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 18136 bytes
SHA-256: 2d5a5cde7bed4ad50a9041edca6bf3c0aee636bdd3406d744848feb9de262c9b

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