Malicious PDF — malware analysis report

Static analysis result for SHA-256 b940b01c4ec3cec6…

MALICIOUS

PDF

92.6 KB Created: 2021-08-12 10:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f84b0919e8d3be0e2dd7f46b6156e10b SHA-1: 14679ef4567bcbae77c95d814fba5cdf76c6238c SHA-256: b940b01c4ec3cec6931d1a5c392e5a8fa22b7f8eca1873951c7dcbce7fb1fdf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://10glazsikeyrosa.ru/file/doguxex.pdf In PDF document text
    • https://bawwabatrizq.com/userfiles/file/tonovir.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac118522294---weniganilopetoxomaf.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/teverutufuvanugivenibilep.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/72842487853.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/jatefo.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/44175443600.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607536c079848---nefilik.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/fenidowuxuzupagetifawote.pdfIn PDF document text
    • https://triosms.com/userfiles/file/68060120470.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0cb49f6cb---nedipodirodewowuketirul.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2e1114d5---8684390529.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b1a554f46b8916a5801734e3af8fc555/napugagixokov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c31434bd---febojedimagomenozulevefog.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/90078389205.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60c43551e847a.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/koxaz.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/6228067822.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/db1f695d9dd617586be2af20d83b38b0/85124169625.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acc08ac9cb7---zetavukakixutami.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/35123008124.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/repig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=coursera-university+of+washington+machine+learning+quiz+answers+week+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 11632 bytes
SHA-256: 8dbb7e031e9bf6027eabafc65bbaec3d60002bac6bda5fe9adcc0c84372aa934
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 18576 bytes
SHA-256: 0b872554bb840adf4a2898b65603c0135acc566530541c6d40b1d3ec2bed3940
font_02_sfnt_off00013cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC2 3880 bytes
SHA-256: bc27adc52a78b38f7d0c5d2d1ebb68b95e186f1cdbef750826222ce9894fbbe8
font_03_sfnt_off00014b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.