Malicious PDF — malware analysis report

Static analysis result for SHA-256 d029b3387440f019…

MALICIOUS

PDF

80.6 KB Created: 2021-10-06 20:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4294c41b3741bca0ff5d766b8d681290 SHA-1: 4a8bdaff696205201da28338a1d3cb8e41ec1ec8 SHA-256: d029b3387440f0192ad761b95477416889d19107c2a478faebd43d017450563a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. The presence of multiple links to compromised WordPress uploads and disposable hosting indicates a pattern of distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b518518b---pedupakutemedabonavop.pdf In PDF document text
    • http://whatdwellswithin.com/file/86307057924.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/25255526617.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/zisusijidivizavimamejujo.pdfIn PDF document text
    • https://administrador.bannik.com/benkio/files/xelunalu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb28b986a---jakezomidumefo.pdfIn PDF document text
    • https://hoongnau.com/upload/files/xoxesu.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/xotusapamipe.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/1919109226.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rikamumuzejonapomitulaxi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tutimitegizeraderodatenu.pdfIn PDF document text
    • http://chinalabware.ru/d/files/99808439190.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mubixuwozedu.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/55751086435.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/265091546.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbe20d27c---saloxexotigefopodepakivob.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/savagi.pdfIn PDF document text
    • https://limadelimon.com/images/file/79041103427.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161491993b2434---tetexoge.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/25723461420.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/53397545502.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/fipefeziwitenudejewep.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pfkdptu2dbm8sjgt47hdhpveos/69299612785.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zipawedudovixedejisuvas.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/84817541121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=prince+william+county+tax+collectorPDF 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_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 18840 bytes
SHA-256: d3e9d9d41fd38205bf1331adbb50ce5524e4376203a6cb6d1bd78513ad560a23
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 10624 bytes
SHA-256: b5ad4501cee3c0fba5b8b72e7bead44984ef5b9c2231c2a039365a9651afd81e
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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