Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9d9d67fc54d461…

MALICIOUS

PDF

116.1 KB Created: 2021-09-03 23:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41d891e72593875c727a6a29e0df2bf8 SHA-1: 9773b384ec0a55d0f57f03fba3cb7a1d3472a9ff SHA-256: 5a9d9d67fc54d461789161d03380c52e2dd71b8aee9a353a3aa2a9dfa3d68849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=adenopatias+supraclaviculares+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/jli00cqotljvu00fc7un5uf691/rurun.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610be3eeae035---56244308414.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210827_24843B77A2328538.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a1c4fc3b---lisewamiwowimupavilaj.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/7131481228.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f4339fa08be5f865593e1333ae83ef0e/lajetuburiwad.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/27008073322.pdfIn PDF document text
    • https://advik.net/userfiles/file/linejatopitapu.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/10860138365.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/835f141e6536e6d2eed4e2791f678552/vigubososezutobegavas.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210623_055640_1051.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e37165a039af812f6c5aee160194572f/wetufu.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbe7e16a5---gaxikulugepewuv.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/59551857676.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/rimigarewixonukonekadobe.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b69278845---88663914701.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/78656277081.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6kjrd6b1tcjg58hrv6v2v87hmg/2141369396.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074168ad07---22894468234.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sibubinusowifez.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jipodigo.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/buboga.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e53ba593c---30401595258.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_off00015e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E37 19992 bytes
SHA-256: 0a124a1e164153b434a1ba526159b2c5195a9a653a16d8ad0d78bd1b9aabd233
font_01_sfnt_off000191cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9E4 10760 bytes
SHA-256: 40708adacce09d21460fb21c43096e7b9c4da9c46e5f7a63a55fbba4b1363a0a

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