Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d8ef3708ef1adc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f89bc930513b9d4ab56f5261916465c5 SHA-1: 83f214ad5ac9f9a15943717cf6f0003a233a2b2d SHA-256: 85d8ef3708ef1adcf0c891b9ca2e91917dd9989f9c2e79c903ac6b099dfd2f42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e9a6ff70---28315531433.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b205240d32---42028073934.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/waganewasifedozuwes.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/gagapasususozokomiso.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e9318d10819cf8e047c3c1a2446dea/68061835209.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e960872f---rokezawuzulujenajopibe.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/foxibelawo.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/98435716556.pdfIn PDF document text
    • https://udruga-invalida.hr/files/45937744336.pdfIn PDF document text
    • https://suacuacuonthanhhoa.com/upload/files/46950477528.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/56181970911.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/bumazizotozipozefiz.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/lekoluwazawupufoxad.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/rigorumusolitadu.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/xosiwuxuxejef.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e669b0a41---jadakijapasofonupupobo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9800a9c83---29600492925.pdfIn PDF document text
    • http://metall-press.ru/files/83834019092.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3dba582b---61918202730.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/93081239438.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084cac70460d---8826430852.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd031046cd5---vuwexep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=phonic+worksheets+printablePDF 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_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 10792 bytes
SHA-256: 9f5f5492153b6a91280fdb3a3038f8dc22e9e8daf14c9116700e84f2299234be
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 16448 bytes
SHA-256: 254be9885d15c8f7cd2c432bccf843b7d461a3e1887f3ef47fea8834a85e974f
font_02_sfnt_off00010ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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