Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba774ab3af72472…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 00:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d21601925238cc2ff78aebe1c76e0290 SHA-1: a27134ce2620c74fe1eab4a16da38fb7e537f0d2 SHA-256: 6ba774ab3af72472f25b9acdb5112e35507c7ac901613fa5c93e0e5776d81001
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document is part of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=dividing+polynomials+word+problems+worksheet PDF link annotation
    • https://mimpishio2.net/contents//files/21073675287.pdfIn PDF document text
    • http://hydrem.ru/images/file/zomofegevanaz.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e7fad5f6---5036630611.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6236a588b75c6ec352684e6834b4e5c0/fofewedonetoresedewelizo.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/dazikijazezimobet.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/44d55e93ea95f54c4fabac7c8905b4f4/wisogom.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/67cd4276d8b3d9d6b0ab272df1e8437e/texovojilugabuteju.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jalen.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/sixilo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b17d9cb4b---fenenejifofopirirulomig.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60121329766.pdfIn PDF document text
    • https://2acontractor.it/images/file/86013843273.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e7f4e58c---ruwiluxi.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/53757655593.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/71688659219.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/garuler.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fenosaso.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/xamafuponidibimodope.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ec5b3b14f---28904129914.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44be1d233---motojatamamuguk.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/104380604.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088c7d2562d5---32367037940.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/56797056202.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/28572697200.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_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 17788 bytes
SHA-256: 26cdd2126cfa6f1e2042563a09e635351a018d106fecf44a40b59148e4ee5474
font_02_sfnt_off000130cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 11340 bytes
SHA-256: 02c41e3e227728a99bbdb257e52de40dfb2796e5ecefb79612eac3d3ca32113c

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