Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e40f3c2bfe2f12…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 19:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ec068432030e4e6269444d5c14951dd SHA-1: c79e4281de6c807f846e29ffe31b2affa78ed9ba SHA-256: e5e40f3c2bfe2f12520717d3c0b9b2e4c4ab9611a3fa8107368c5fe3e0abe41c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the presence of external URIs and compromised CMS uploads points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=mio+alpha+heart+rate+monitor+sports+watch+manual PDF link annotation
    • http://se-ty.ru/uploads/userfiles/file/1859691490.pdfIn PDF document text
    • http://mobilenmr.com/files/files/18853168437.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/66212136709.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6b31120071170dba9ff6284a47a714f0/xikagirokowevikikamonob.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/ratutodirizivapamironuk.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12cc737d3---bubewal.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/kavutuxo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/85f2c012bf960489aa0e5ec00a36d9ad/97420421166.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/30120176065.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305b77a294a---gulolegopigebafekozemiju.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a52e4afd---7046819861.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/34062501712.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/adc80122cc794ac3dd8c4ea52dfa023b/xepowuxem.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a0b5753a38435fca81e6522b2f03dd4/55370093457.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/zabosogupow.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fefbdc2b---50908873120.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/77599117052.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a033c841---lipezanid.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e1858ca5---48187018363.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/2346933752.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e99998ad---53780527570.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/19892318188.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ac29b94b06e0295efb8842da31da3009/6583551491.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf4bdef6e---rokexuwusokokefiz.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_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 10820 bytes
SHA-256: 5388dbe31b31abe995f1e5fd0f1a4e868f9025bfdc9b170f964b32b38efe4aa6
font_01_sfnt_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 16168 bytes
SHA-256: 827ba71f87a1b197b14d7406e71f0e3b972e0cd5edb1bd7e05f9cfa476cb128c