Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c77317ba087ebe…

MALICIOUS

PDF

82.8 KB Created: 2021-08-23 14:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9cba2811355833c22877eeb80c1d4980 SHA-1: fbe86a8e25ada6911fe138c654c717f9067abb8c SHA-256: 07c77317ba087ebe3a9b194453efac7488d6d037b8b55231bc284ade6559641f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs, some pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs imply an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=best+hydration+pack+2019 PDF link annotation
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dae22a732869f4e9b6d2cf5e23d95417/muxezasumijepiraso.pdfIn PDF document text
    • http://freeski.hu/freeski/file/72612170032.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nehg6ncq44knj1jom2d393uqa0/29295567542.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/gagepukazuliv.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/49846241378.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5249321c3d7da2ebbbf82e70445e543a/kunodaragejepenowedivul.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/miwavatinekenu.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/sivomugitonowupepelilipem.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a4eae52e6---53378720042.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/61635209764.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f5aff8996dc8850b92323c967b694238/kosujedipuzikafe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8e64f6b8---83215300272.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/37015186652.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/jamodurebup.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af776f3dd---fegebo.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/gepedoru.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kimujuvemil.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/67127127796.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607984d0124a7---tiwimufonal.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/44006232771.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/zetutufovorozimadojebotep.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/74dc887203dc4413403d0804a08c49d2/41991664272.pdfIn PDF document text
    • http://risme.vn/files/zakibabatagovolufetovaga.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96b9956f7ac3dae3d27b3836e41624e3/20740290732.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_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 11284 bytes
SHA-256: 078473aaab5fa21b0b69f7aaa7d14fd229ea708b9b219881b4786f8727becc95
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16392 bytes
SHA-256: ac154e93bb8bfd7eb66eadd95810ba37dfc70390c8b0c24ab4b271170d63757a
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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