Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce4ec0173935fb1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 18:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ee2a5834c0c3fc441e6a75108e88d30 SHA-1: bca0058f009946adfeb28a52bc231161be3f4cf1 SHA-256: dce4ec0173935fb13ad0e20dbb2263a1bac8a21e5e79e785e7cd49ecb5180c35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=mod+apk+minecraft+android+1 PDF link annotation
    • https://autoradiator.mn/uploads/ckfinder/files/mavunojenolagegife.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/492c4999330837f46c6b586340eb907e/87167715945.pdfIn PDF document text
    • http://tid.vn/upload/files/niguwajodirufawunu.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/roverira.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fokunoruzozuk.pdfIn PDF document text
    • https://aashianarealty.com/file/34556168277.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/31pvbp93rbe0cha4s8hos96d5l/lapilovukenoponal.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/saluj.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16146b7ab6137f---20251360157.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/gelubepekinu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/7038233171.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/3284281006.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/wokukeromagupamepoli.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/55745778396.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/patepanopezatufowapenof.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/71835392265.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/zepup.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/48717714962.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/78126231620.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141182245863---pukapuramipuvo.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/wefoximi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109120525201676.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/vidosakodif.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c8485a99c3bd2c5990a905d843143c9b/lokan.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/dusibujokaponisibipopo.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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10704 bytes
SHA-256: 1bbe05ebcbca214bd3539e551e027857303304b28ecc8ee593308610cbd1dbb7
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 17512 bytes
SHA-256: 88eb662c1f43ba395eb06789bae98e5534ee3e3d387d2579810d7f5e99c63402

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