Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76c8644d3b0448c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 14:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2375d7cd5714b70368ec018ed28d3ef SHA-1: e7626e25c8adcede27f6c0ad6a9415dc92e7a5fc SHA-256: f76c8644d3b0448c417024746d09fa48f7beaeba7181ce84b3d1c4ccb47f3429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, including those hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=auto+translate+a+page PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144da04d3739---94385798918.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/lekubatavupujolinokoxasir.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/27839988319.pdfIn PDF document text
    • http://expresskaliski.info/file/tewulixaxelibufuz.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/571071450.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/modukonedalepasititij.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8cefe46d955df51ee92119708fb70706/46401540404.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/nuwomuwexazogilisi.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/gasevatesotoxalelulo.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/79938118902.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/vivetuwoduvuwomama.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6eg0958bbk322it0fbig3s2fku/82968948070.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/vomenizisozisiziketigu.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/83534483422.pdfIn PDF document text
    • http://fabriziochessa.it/userfiles/file/71619542958.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/ridedoradinumenude.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fedevudadogoxiwufuxabuli.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/15667287482.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/37628659652.pdfIn PDF document text
    • https://hinaweb.com/upload/file/50521862053.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/jezowudinibidi.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/niwazoforafami.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zitemali.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383226914f0.pdfIn PDF document text
    • https://kaparatt.com/images/File/liforivefenatu.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/pukigekovedozo.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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 16628 bytes
SHA-256: d5075806298c4aa95d20e9cd8b7babc171b54b924480135f3e4462cd90b59f9c
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 10416 bytes
SHA-256: a086e34542a828bc4d0f9a8046bd948ea37adae564e0409776bf39031851ddb0

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