Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2313afa83183b8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 06:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0feacc9d88403a0279e7f274bdde390 SHA-1: 8f8523b3bbbf73adf6faa469791666077f3c93e1 SHA-256: 5d2313afa83183b8bfe8de06f53cbd6ec85816f525e9c48a7e94fdb9d0e4f249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves directing users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=legion+movie+online+free PDF link annotation
    • http://usateatop.com/_upload/files/75511426699.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/17406347977.pdfIn PDF document text
    • http://videlec.be/ressource/file/37936671181.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/36107365734.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210903_100435.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/94809404748.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/31099426523.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/xulebijusela.pdfIn PDF document text
    • http://apex-architect.ru/images/file/31629393595.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2ak4quqhmqc3pdpe2er9fog5s4/durabukazofasewifovuxu.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/supazujabafuworiguvewemof.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/2347321962.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/36355905139.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/cd2454c0efa105a530a60b1502877a67/28228504369.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613284498467d---felulumatufevuzuvef.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/dotimivepekebelerebu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394cc0b6781---luzipu.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/86333463439.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/52e5d8315e2ceab9a28439ba1411026a/zumav.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/nijino.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/3608398892.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vewekepopitexeratezur.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/zowinoruzageresav.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/61492633357.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bamakojoxinowogikasusazu.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_off0000bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 17740 bytes
SHA-256: 616edb7e4c0919949388df68f5aac3a7fc80568834230a95c949293be6ec9c3a
font_02_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 10152 bytes
SHA-256: d4d0b2c3e5cdc8b5db1ab841f20eabf574347aae17e4c32520dc720c1d0d5583

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