Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f0380b3d3ccb9e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71548d5bb57a9bfeebe2254d43741cc1 SHA-1: 0f628b1b5b0b598017eb9b76116a99b651ccc37a SHA-256: a2f0380b3d3ccb9e3d671e0af4a9e384b53bc4e567a89bf08abbe6307dba6d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users through search engine optimization or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=minecraft+pe+morph+mod+2020 PDF link annotation
    • http://msdoubrava.cz/foto/images/file/kaxetuled.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/razeruk.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210912185619.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/31765158220.pdfIn PDF document text
    • http://falerisztika.hu/tmp/38305010232.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/sitavomekalasubejo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109061443194271.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/4982924797.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/3189878151.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/088fa49f9e6fccf4e12c3068c7936d9a/8261837042.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f323c9eab6---43786381135.pdfIn PDF document text
    • https://begili.com/uploads/image/files/80085364636.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sewogawotupulit.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16309137881159046281.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/47184231528.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/83083062414.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0c272f97---manadejunilaxuwel.pdfIn PDF document text
    • http://africareview.in/userfiles/file/39687032145.pdfIn PDF document text
    • http://kd-council.com/upfile/files/85509336798.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381f8c59681---90703167278.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc86d7e6a---xunijul.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xumodenaxanu.pdfIn PDF document text
    • http://xprchemical.com/upload/files/zuvawebutevipomago.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 19356 bytes
SHA-256: 3c9a8197193bdd632ebe8b247a773b742422616a3b81a0f4ded7d82bb306e609
font_01_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 10908 bytes
SHA-256: f961c96b768333ee49973d102e989e02a5b36cfca307a66a3f5a99c85b4b5a35