Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac2a356516b905…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 19:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e7e31fb037afe3e051efc6b35d3ee4e SHA-1: c393e294cff46e43221f5284e6d6e1e70ddb196a SHA-256: 16ac2a356516b9059a5666b5ea1699c070e522b93edfd1145f6aa5add3da0c3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs that form a link farm, pointing to compromised CMS upload directories, suggesting an attempt to obscure the final destination. While no executable scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://studio5r.com/userfiles/files/29545597995.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sq5rkijvq8jjehdo3c5gv994vt/78486677114.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d276c22fb8e88ff6541ffb0d8ee1cd24/44632751654.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f483153b---jawawaruzopozax.pdfIn PDF document text
    • http://raczcsalad.hu/files/34530250271.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/81911844605.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/12957675523.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/sejabomavosuwitosulop.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd7f9b18e---46734096884.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bfc67ee3---56198513202.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/60687895264.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/fumipajupaf.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24a429c8bf---3831117957.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/eg67sciqc5k60p67m36ha5pf47/kijumaguleluvujuzuve.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/jozodisuvedajapa.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/34836263150.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/refelafelesi.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/30292027823.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb360d72a7---78368241841.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/bivixubokevizitot.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/89df2470daa2925123fad4c07ee3bc58/16233202629.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2738848d0f8f392247aadab402a3ee2a/somisilekavefinejilir.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/16207045634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=access+control+security+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_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 15416 bytes
SHA-256: 57f7ae976257f7bab0b2f3d1f6f2d84fab3220809ae4bc7744419fe59e506915
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 10644 bytes
SHA-256: afc4b3094506d51df86c89ba90ee7176ec157c64a2ab5af4c3414eeb57531e14
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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