Malicious PDF — malware analysis report

Static analysis result for SHA-256 b143e8bedb7dfa62…

MALICIOUS

PDF

81.9 KB Created: 2021-10-10 09:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d4b5f6707630564028fde67685f24d0b SHA-1: c65dfd2905aa43973680edfe86fe577dc6b99cee SHA-256: b143e8bedb7dfa62a51d91e5033975dfa6b9f09cea64d5927f23da39c3d01dfe
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 a large number of embedded URLs, many of which point to domains identified as disposable or potentially compromised CMS uploads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary purpose is to redirect users to external sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://vector-food.pl/userfiles/file/gatupenebonisuxevofox.pdf In PDF document text
    • http://coreaad.com/DreamDataUpload/file/78641651172.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210929120432.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160229780ed0---xemasuzufevira.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/bolurage.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/62502319345.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/48597384975.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/13664076616.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/xuzepozukitozigipejegax.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c61cd672d0---nojogiwififanaw.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/9442441024.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/78164800473.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/bomonabobew.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/14196182608.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/zukudovusezisebepolegedo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fe8853f4---18697247399.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/74145941402.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/sivinasizofezoxo.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/43775540377.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/75226932848.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/bobijonisupololatiwadunik.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf202c0908---9259730367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=competition+wizard+geography+pdfPDF link annotation
    • 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_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 11020 bytes
SHA-256: e2d8cda7241bc762504b1c891bed04691c2c2730eddbee5e8b165fa5dfbb6870
font_02_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 19280 bytes
SHA-256: 5629eb0dc1827f3c4a9bceda48cfb31f485d0c1ae9ae867631f02b08da0b74d6

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