Malicious PDF — malware analysis report

Static analysis result for SHA-256 c276579704c0a180…

MALICIOUS

PDF

91.3 KB Created: 2021-09-20 10:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb6380341292c676c8f39897989b2c89 SHA-1: 97466984f999f62cff3971d40c1ac732076e7809 SHA-256: c276579704c0a1804c795a550c5f3607aaf20914033a3be2b7770623a7920bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs and the PDF's structure suggest an attempt to trick users into visiting these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fibertechnique.com/tmp/file/fimamage.pdf In PDF document text
    • http://laboratorioshamalab.com/userfiles/file/82501487928.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/24880874136.pdfIn PDF document text
    • http://119pump.net/d/files/kubufukulomenoxubawidul.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe0df937b7---doredisowokusinu.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/tafiferabokovuj.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/dikofexagegilajodaluzis.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/36098266791.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/23629184937.pdfIn PDF document text
    • http://sun-eko.eu/files/file/tixipez.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/45042893215.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/70660306819.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/66018641302.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/73733495842.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/gubivif.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/91165516431.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jazojipi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613426320869a---pewogogopidonuxidej.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/48008368864.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/43962646016.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/75278166366.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dasemizuwowokexo.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210910182152.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/593e6a8f6460de9b6248bbea62226bf6/logileziziga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=agatha+christie+plays+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_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 10768 bytes
SHA-256: ee04d409e02473afe890a6e46097f4a86653d1523fd6503dcd990fe32dcbdc96
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 18056 bytes
SHA-256: b67625a9c1dbc1997a5b855ed76d383ae9f844712b3884bb58e93e9ac26ec1a2