Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ae7dcd5fa1a0e4…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 01:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37556427d5a0be32365a08161bdfca62 SHA-1: 003c2292c4b2b0717475f16b0b7cb6c088f800e3 SHA-256: 69ae7dcd5fa1a0e45b86e5a38da0637ea0051e2796a9a9f8b5addccb06f4943d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=rollercoaster+tycoon+classic+mod+apk+unlimited+money
    • https://rcvizovice.cz/ckfinder/userfiles/files/69850440278.pdf
    • http://naphotelbangkok.com/userfiles/files/48056347826.pdf
    • http://sanmorales.es/userfiles/files/sufodiminiwusobuvug.pdf
    • http://goldsunjsc.com/upload/files/sekatugeruvajap.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/40692449207.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b655e8dcbb5eb253a0b79265f739305/1681621289.pdf
    • https://happen.webasl.com/userfiles/file/55004060990.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27361583548.pdf
    • https://mudraconsultancy.com/uploads/files/xinovixogukidadanogu.pdf
    • http://puginternational.com/ckfinder/userfiles/files/40584093007.pdf
    • https://holocaustresearch.pl/nowy/photo/file/36358031887.pdf
    • http://purofirstli.com/userfiles/files/setidofowupagokas.pdf
    • http://tuttotop.com/userfiles/files/xivamul.pdf
    • http://bn-biz.com/userData/board/file/sevozejisisoxasorano.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/52002289573.pdf
    • http://duhochoangthanh.com/upload/files/38455048305.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/79447388858.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/69233558589.pdf
    • http://pescepiana.eu/userfiles/files/puwetidadejawovenunadexaf.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/sunutoxabogoladife.pdf
    • http://hichipper.com/hichipper/uploadfile/file/2021091704441973499.pdf
    • https://pbchistoryonline.org/uploads/file/94439661037.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6kssc111evh3bdc667niuhu6o3/xemebanoduxu.pdf
    • https://talenthunt.biz/userfiles/file/mupijakepuva.pdf
    • http://houstontca.org/Content/uploads/files/79657542766.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c331706877b89ab76ded08e24e100a72/zawekakababimisulugimafun.pdf
    • 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_off0000bc90.bin
faa2ed09de471f552517794c8020192e45f11c30b83e846e54d43a3cce9099b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC90 16172 bytes
font_01_sfnt_off0000e622.bin
ce3ae1193b9f1c5f18ae8ec706020900f5f12f57d0c0720a8ffb7f3d98ea053d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 11024 bytes
font_02_sfnt_off0000ffce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 16792 bytes