Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdb8a182f2b3aa1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 09:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7182b79492e9f11731df6127c19a12b5 SHA-1: b82257f6378e9990f90a61d3c605039bec9c1731 SHA-256: dbdb8a182f2b3aa1e2689610fd2edf42f35c3c7f18413731f291594dbc3f97be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for potentially malicious purposes. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://krisoc.ru/uplcv?utm_term=the+hobbit+the+desolation+of+smaug+live+stream+free
    • https://dnmpaint.com/sdcc/images/file/80303962366.pdf
    • https://griby.biz/ckfinder/userfiles/files/kifutudilinizefaxinoxem.pdf
    • https://volnynaklad.cz/data/file/bomiramozo.pdf
    • https://zniczekowalczyk.com/user_images/file/simipig.pdf
    • http://moonlightmontessori.com/upload/files/ginolenoxijelezi.pdf
    • http://servmed.net/userfiles/file/34347384936.pdf
    • http://portableandcool.com/files/files/49339568286.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630807178_62dc0308b2.pdf
    • http://bakefruit.com/uploads/files/202109070851494715.pdf
    • http://makesrealsense.com/ckfinder/userfiles/files/kifuwu.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301fb938880---67176327700.pdf
    • https://labelmarket.eu/data/file/79605302292.pdf
    • http://www.culturehousesun.org/photos/file/93259549148.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f568a2a3---kakadag.pdf
    • http://architettomontanino.eu/userfiles/files/vijukozinamet.pdf
    • http://ehomeforeclosure.org/images/file/tejalabex.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/36186487911.pdf
    • https://vnjhanoi.com/upload/files/gogirulujataveme.pdf
    • http://oilspecchem.com/files/gasuralemesixufofanoga.pdf
    • https://sofahatinh.com/upload/files/forizoluborisisedipix.pdf
    • http://icltindia.in/userfiles/file/zeruwuziganukowa.pdf
    • https://at1-turbo-j3t.com/contents/files/fumabamur.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614317086c8af---rulole.pdf
    • http://rideabikenews.com/user_img/files/gatedabuburer.pdf
    • http://ukwoodrecycling.com/userfiles/files/90170843971.pdf
    • http://markone-tools.com/upload/files/7088862039.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_off0000b0c0.bin
3f71420694b7af8a0d3123bdf30520691c9c8fec987bf13c1c7a2c6df419b218
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C0 14556 bytes
font_01_sfnt_off0000d4ca.bin
dd61510682b184deeb775b04c7a38cbf3ca811000e62c1b8f26b588a0c0c7d12
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 11072 bytes
font_02_sfnt_off0000ee2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16792 bytes