Malicious PDF — malware analysis report

Static analysis result for SHA-256 25652a3abaa742b7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 07:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca434f7db20dc2bdcaab00a485380553 SHA-1: 558c6b1806691de5fa280874a31457ee3cc499c5 SHA-256: 25652a3abaa742b7bf4dce4c0ec2b50d82db14ccdbed5d42cca56ca3a6dcfb6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee06bfc85---14070381451.pdf In PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/18911857339.pdfIn PDF document text
    • http://change4best.ru/upload/file/varolekuvomuvodis.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/39308655572.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/28898251118.pdfIn PDF document text
    • http://nktrading.qa/file/files/mukinagabutineg.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kanix.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210907_E7B1D4AF9CC12520.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/lujamufawu.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/bokukexowuvirilepeguzopam.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/pofapefofilomalamavomaxod.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vumuwud.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/2448996730.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/10349ced28bcad89b292c6e783f8ed0f/werefodipomuga.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613679c68582b---71508298909.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64abba35439d441e25fcfee6ec316fee/83785374811.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/60468718c14bf30fd8492b9dbe34bb11/35951287343.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/42555361009.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wogisijatutedapivomodezex.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/94859430703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fruit+clinic+game+onlinePDF 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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 10480 bytes
SHA-256: 63bb6636f0fa21277519c4b5d70428d7aa76814238ae5acf57d1cbb8c44e4548
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 17200 bytes
SHA-256: e29afaccf36a195bb682af3c4012d35b3e810270ddeb2401367471e80cba6d93
font_02_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1