Malicious PDF — malware analysis report

Static analysis result for SHA-256 130199851f49b4b0…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 04:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35b4c7b02c834b53bd6e3a0405a6d87b SHA-1: 578bee664768d7b11aec9874600fd9281f5a612f SHA-256: 130199851f49b4b0288f6c0b09b69b3734a2513c99bbd15fba17a7dd50f3b27b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URL analysis point to a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/6hgg55rj5007cajsh9mjooh1ek/josavazimopif.pdf In PDF document text
    • http://abovomedia.hu/_user/file/debamudebowefurisowi.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba780aa20e---38525400981.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f5216b4e39162d85c52efe9d5e6739ad/xurufinumon.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/wumidurukoxiw.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/safawenuro.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7ina225if0aq58oeofefhrmlsb/patepidazowoko.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/baf7c6492bbc5675a67d8ef0b5c90cc7/bibalezobibarugub.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/texanezotasesexipik.pdfIn PDF document text
    • http://abc-tel.ru/data/File/79083291475.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210607014354.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3702c1439---jirinaduzu.pdfIn PDF document text
    • http://freeski.hu/freeski/file/73203192753.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1aae71ca0---gipamidirop.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/nerukusokufisiduwoxe.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/63915113065.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2bf4c1e9e541dd6a07c04ee8ff39b3bb/lisaforekupowaxuz.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b77980dbc---dejejaxajubij.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/vukitirunizelewuwifusamov.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/66743786763.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3765669c3532369fce538cd2e72bc9b9/9184662637.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/48e9b656eaf105212d4951f1ac522306/37134861341.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/63876219201.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bddb121f40bba61c357c37f71a628a4/likiporo.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210607_121342.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba0fd789c---mufewaxojosebifalixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+many+prime+numbers+are+there+between+1+and+1000PDF 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_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 16936 bytes
SHA-256: 33195eb4d1abd36794b15f7565304183033b8d5a9f2d0bf3739f38ea68350264
font_01_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 11216 bytes
SHA-256: 109f2b3470553303fb40292d3245525febc454c25ec9c8ef4e12c84f7d86a505
font_02_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1