Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fae920590a4b0a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 13:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 669344d3c3d2f5c2d740bbb2687a2451 SHA-1: 61112bf917d5c15b51014263efbb6aed9b6c3ddd SHA-256: f1fae920590a4b0a084c8e3d43471a8802461dc3f673f28e8734c07c52197791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=pharmaceutical+operations+management+pdf PDF link annotation
    • http://dotykbylinky.sk/_subory/subory/31943312667.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/58051911253.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ek8g11e2tskcl2i3k2nsiitot3/42986515184.pdfIn PDF document text
    • http://cpils.com/userfiles/file/26166282153.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pajolamobuxubi.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/14355540585.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/97454658135.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/34024619616.pdfIn PDF document text
    • https://peterdegendt.be/file/69379665047.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/lamojenaf.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/mugimeneza.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/88163646266.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210919122943.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/dafomidetifaso.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/pivelujasexuju.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/73386478440.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/27450221425.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/luvudadijusekupodagojakoz.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/storbbqv7d77fqppr9l83785k9/57657115703.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161351d87e5507---mifadadupobavonemaxexonox.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54543850dc7e31a7dcdebf4f6f987c84/94216362041.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/fixubudejojedelimasikudu.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/gomewosagur.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/39711691407.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/35052126180.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1654176124613e92671fbf3.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 17416 bytes
SHA-256: 89d0d234bc8faa44388b7b5ba1c5c1f381994e5d4fccb0b03b1ab29d42a33943
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 11168 bytes
SHA-256: f1a14bed5d5b02acdb08041032164c26b35324d8a145f2e82d000273dd3ec60b
font_02_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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