Malicious PDF — malware analysis report

Static analysis result for SHA-256 b117ce16958598e2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 11:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11747fcabe29b88a207f3621a22d1e8b SHA-1: a8983aeb7656f7ab3b6fface4c69fbf903e0558a SHA-256: b117ce16958598e2caa89cefce3078faeef084a0618df2c9df075fa96c48aa7b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and a link farm heuristic indicates an attempt to direct users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=ethiopian+intellectual+property+proclamation+pdf PDF link annotation
    • http://around-sicily.net/userfiles/file/fudekejezipuka.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/44855283632.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/sirugugowuzuveke.pdfIn PDF document text
    • https://airxps.com/userfiles/files/80845730513.pdfIn PDF document text
    • https://aayams.com/userfiles/file/feparexurolezog.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/97345087424.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/juribazejivulot.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/39458939667.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46013100508.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/vekovif.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/vovebejanupokomofe.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/1843394793.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/kibesoponidixifadetebuk.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/faxokunadokaxapo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e505a91---benejum.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/61e07f7ba3c0b89e44f45fc8c61f7daa/80089332537.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1116170518.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/46909722825.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/92238460621.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/jewisiximiw.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/84385480037.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/nomomijujavorom.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30060412234.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b00a41c5f---givevofaga.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_off0000bc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC54 15756 bytes
SHA-256: 577314c704997093a60ab5114f323206993281cc51dc0db3f750ac24bae7ed3f
font_01_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 10912 bytes
SHA-256: cde0f8c423002e82afea92c7ac4fca4a5f855494c01885a307b308d5b66918df
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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