Malicious PDF — malware analysis report

Static analysis result for SHA-256 825f5a447f1c1ee5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 10:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 326b1dec87ca24c285bc8b9a46f14dbe SHA-1: dbac9be25d846cccc719330cf7a90ee9e23f7144 SHA-256: 825f5a447f1c1ee595c33d0d898c8cb19f33aef393a0136b9ec4a21b9d363d01
212 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external links, many pointing to compromised websites or disposable hosting. The presence of a 'Browser extension / update installation lure' heuristic indicates a social engineering attempt to trick the user into installing malicious software. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+to+save+internet+page+as+pdf PDF link annotation
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/94019754163.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161314941b1b6f---najavujuwosa.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/60893419344.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a92db60af200db754abd786e5fbc3bda/pexisofu.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/65039204230.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bomaruzigabutifolitesora.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/lomasenaleku.pdfIn PDF document text
    • http://vkts.se/userfiles/file/63238170647.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/31958593393.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/90364231733.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/wewafabimolefalosug.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/91370175096.pdfIn PDF document text
    • http://myslizdrave.com/soubory/67111933378.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5961ce625---jutesegama.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210906023147578839o6a75.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba113394c---guvetazusinovo.pdfIn PDF document text
    • http://falerisztika.hu/tmp/pafase.pdfIn PDF document text
    • https://songhong.info/userfiles/file/31959768703.pdfIn PDF document text
    • http://tano-cable.com/d/files/88448821068.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/50853831842.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/surenesofidiwokaxaded.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/72545798211.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/bobobedewaripaxugewenoko.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/26656437408.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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 17344 bytes
SHA-256: 82fd16cb7e325a07387d6d7b0fd126677f8d5ebef288bc134f30368355afbddb
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 10768 bytes
SHA-256: 8e1164025f787ae853d5f1cefef67d20ec0fea1402aef5f9a87a5da671a6e8bb

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