Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fd67bd366db797…

MALICIOUS

PDF

76.9 KB Created: 2021-06-27 05:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6ace89359cfc192c365f96b0b045525 SHA-1: eb4a99f7bea2d7ba610c91913a58791f2502d3e6 SHA-256: c8fd67bd366db797cd9c589651b3e5b86513a490316c3246faf1b5ae3017fb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm on compromised or disposable hosting. The embedded URLs, many pointing to PDF files hosted on various domains, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7839082a---rerefetetojinutekubafi.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/suwexeruvipawopifasifi.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/fefiluzakunosume.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e77964706---16341959650.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/34823709308.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce74b0c357b---84008750270.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f23f2ed9---nolitowaxoninebobefaka.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e6758835---gowariwulujefowalebefubis.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o385pmsm9uamu1okegpil045br/musik.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/sesakobegazunofaxu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/nozudovaloduxivoxenidaku.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24791467387.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/bazumolulotura.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b4181226b55cc5e872ea998066083019/pojiradegupiluzuwugebiru.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/58898264451.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/66568929750.pdfIn PDF document text
    • http://northcity.rs/slike/files/1744484400.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/80239585770.pdfIn PDF document text
    • https://cooperspick.com/files/78682551268.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d635014d1a---23823001076.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/42886592274.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a1da1d5e6f2769d6c8fb75152d850bf9/biwizo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tizigovelati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cyclohexene+and+concentrated+sulphuric+acidPDF 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_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 17236 bytes
SHA-256: 4a43b56d26938f77678e376045b55a6776a5fe71fc10703a219c5ec45732dafe
font_01_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 10956 bytes
SHA-256: c35b83ce836b098389124becb6911bfc70c9dc6cebb2ac14d741ef1cad51f66c
font_02_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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