Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08c7ce089dbe360…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 18:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8e2e2a99a75c0bd0288faf45786970c SHA-1: 963538298d9b36471e89adaeafcf4bb1af4b5fd9 SHA-256: d08c7ce089dbe3602463a6084d60dfa86b5b979ec9f62bd83b04db023c2fec31
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=messenger+chat+heads+not+working+2021 PDF link annotation
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/tezane.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zapitakavoderukafigumus.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/sagububemomadatal.pdfIn PDF document text
    • http://enricobarraco.com/files/vuwotiwasavudamoj.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/baxuxi.pdfIn PDF document text
    • http://vucert.vn/uploads/files/jujutowusotokunofubogegi.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/83957373376.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/24626063001.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210905030600.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/naridibisaposimuw.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/93706647237.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c5cf1396255dd3f9c0cc8c96b28b7849/65679844668.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6142195C32832.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614455ecaf540---zibesijesa.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/86111216884.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89954244131.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/89744877401.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/248107705f6990e45400106c2ca8b567/pukujajapi.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/kefafezagozelukumobikodum.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/suzapexiki.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/30901193909.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/90727336155.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/wazebevupexesuvunelim.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lidas.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_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 18188 bytes
SHA-256: 6ec03b1f0c38d1c29f7e6f01a2ba6c3495fbbfe82ff22aece488c29c60d96720
font_01_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 11068 bytes
SHA-256: 09373c164e8094020c707f8ff81b49039dad3e475a30ee2b5fb7ecee7e601b9b

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