Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb634f52bbf350f…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 15:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb8557285219447af957b16dfe000a96 SHA-1: 514bc0accdd3c7b36c8dbb252aee888e79d859e3 SHA-256: fcb634f52bbf350ff44149119d585bfbf5ca3d80fe574a6b293105fd3e6b96ad
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 contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://synerhu.ru/uplcv?utm_term=introduction+to+cognitive+psychology+ppt PDF link annotation
    • http://jurabos.nl/include/editor/file/walaxujijataxawosekibose.pdfIn PDF document text
    • https://armenia4d.com/contents/files/dekazipilewetux.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/tunilezonowidurowozejusat.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/68957592004.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/tabamab.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/golatenixupogedaxusokaluz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614b95a19d4f2---50117470320.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151a6d533bf5---82378839635.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/vajivit.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/lujuwevekafalakuko.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/fanipajumafowu.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/beburoxoviwilukuviwo.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/kisuveruvavakoj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/67092599203.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/53099684034.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/49100182402.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/potuxibijepefasamosadur.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/95486176639.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/88604881433.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9fa4a02eb4d9dbfe1ab989948b04a9b1/859689952.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/julunojisedivikolazupawag.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/99815474533.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20211003_195818.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/linixateritenekunel.pdfIn PDF document text
    • http://labsshop.com/d/files/27345521864.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/17114793468.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4d6eedc2afc09954e9dd55b11610b428/bedijavikovo.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dagevazutuda.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_off0000b693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 14392 bytes
SHA-256: daf88e03d4a39611d76e138d3525d07a41afe386231da77b574e391486135d23
font_01_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10860 bytes
SHA-256: cad4884ae271e99016eb1b44ea48ef3c263283bacd91ba3da3178c4397a7eaa9
font_02_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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