Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3be18049f29573…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 18:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4401c046dc5525e15370305fd54a06d7 SHA-1: 2a4b87c369831f3b1869cc2b9730ca9849b8e968 SHA-256: 4c3be18049f2957391c73d6149c87327c781df229a4ba1c347f55fd43addfdd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=algebra+2+%28conway%29+evaluating+functions+worksheet+answers PDF link annotation
    • http://polyalpan.hu/_user/file/naxisefimeful.pdfIn PDF document text
    • http://chinalabware.es/d/files/vipegoxotifoleg.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc6964bfa---bipapagavubo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/vakifipuwez.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/97389989504.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/warola.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibrc5reco4er7u7mobve0puemv/74208461385.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/82162723866.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/520ae8ca76cb8ba1ba08c0208dc052c9/muzudogosafowato.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/mubozeduzenadadab.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/befarufunona.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3490ac0db3---temosabiwujade.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210825_5F3A0E6B192428A2.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/43069157537.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1472762d5e---98639448370.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l9vgvmdkek9gc4febn48qqi305/79909596636.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/74949844534.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/dugenasadojabexizagazeb.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d8b76ec1f---jipelovijipigemu.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/damuzivegafoxenitevun.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd64239894---29371128070.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/tagoxezilob.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_off0000c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC330 11468 bytes
SHA-256: e16ab861cb6fddad93fcd37c72856e5115147a70e4fc136f63fed74e793e8e12
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 15880 bytes
SHA-256: 4380a8333514c2ca6cf347f46197177331cecf55004627a7d320ba533deaee95

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