Malicious PDF — malware analysis report

Static analysis result for SHA-256 1054692048914f2a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 18:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb0bf24599e98f09cdf234da834bdc72 SHA-1: 269be8a20a909a5e368de11376158403f43b8246 SHA-256: 1054692048914f2ac47524fe0524c90d67e856f519e615533624bb86e592dfed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://neodentpetrosino.it/userfiles/files/nemekujifelomodijujazajo.pdf In PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/lenot.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/nedotibagol.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/butekimidipaxu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d09b9dff---sonivalunumamufomovudob.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614038add4805---32061502919.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/selexe.pdfIn PDF document text
    • https://shidoremicrosys.com/media/visosabokonezusekix.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/68662698962.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/65869299958.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/69567388694.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109152123391958.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/89246661457.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/77303655517.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/55412705265.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/kikafujevuxuzavedamore.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/93416157847.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/526706708.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/zajusevowen.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/vutuwivafevoseforizam.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/14629646940.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/def612450d41ae9b526096ac4b8ee2b4/40939468651.pdfIn PDF document text
    • http://espokebar.com/uploads/files/lomalu.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jerufopimese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=body+race+apkPDF link annotation
    • 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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 16936 bytes
SHA-256: 7162fc30b855067aa5671296443cecd9d0e6da93034bc6c180dfcf440a768adc
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 10260 bytes
SHA-256: cf75152fd2b79193637b920ae77a1d15d66c1db7b08d6d5bfb595f97c752c9cb
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1