Malicious PDF — malware analysis report

Static analysis result for SHA-256 be335806e90319a8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 00:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40e5c837f8b7d41b90f7f742698fd2b7 SHA-1: 4d5cc8eaede7d14f912a958e5aac3c3a2cc28646 SHA-256: be335806e90319a8ffbd517affa833b5dc383ae1360a491f41409d302963cec4
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS uploads and disposable hosting sites, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports a phishing or content-distribution attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://domario.ru/userfiles/file/22882813456.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd7bc2fc8---5194375597.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/getitivifed.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614655acd917c---totazijafofan.pdf
    • http://elijasprojekts.lv/files/file/35076922010.pdf
    • https://equimat-cheval.fr/file/49614646957.pdf
    • http://ritadas.in/userfiles/file/sowivunalov.pdf
    • http://thaisomboonautopart.com/userfiles/files/39611845600.pdf
    • http://cokhixnktientien.com/Images_upload/files/xanagapawunaxidurufosud.pdf
    • http://parkingparts.com/Upfiles/file/wiwotu.pdf
    • http://ceramkgres.ru/userfiles/file/56707393195.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/rogofekawu.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385927d1426---govimubadira.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1e82307dc62ff573d56502c917ecfe31/28373845327.pdf
    • https://ipekyolumedya.com/resim_galeri/file/jagelewajuzisidejim.pdf
    • https://eltechma.com/zdjecia/fck/file/begomevegazef.pdf
    • http://tortsurprise.ru/upload/redactor/files/vitalexuxudoxiv.pdf
    • http://newkontakt.ru/userfiles/images/file/ditakixadapolunuremal.pdf
    • http://righetti-ticozzi.it/userfiles/files/75044487613.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/6766890835.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/jonuru.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b54000a21---giwajuvejegekupipuxoruzid.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/88077576858.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/88015448521.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/63844441571.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=aquarium+live+wallpaper+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1a.bin
148f19e342ba4f8e0d1d01add938e85953e10ef68465f91772bd8c77ccfc4d42
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 20844 bytes
font_01_sfnt_off000105a3.bin
27e80f2054400c0582fbbf26b57ca0f8abaaecabd4161214b44aaca396727e33
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10760 bytes
font_02_sfnt_off00011e22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 16792 bytes