Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e745ea28ff5b53a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 06:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9142f6d70ba485bdbab63b4f86db01fe SHA-1: 84b113b0f8cadaa871327c56a0519c8353d7aa2f SHA-256: 9e745ea28ff5b53a931de68ed582f4a35e665434669ef7d3a4cf8e4b067a1fa2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mim2010.ru/userfiles/file/goserajaluwesokameti.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10dce9b54e---dovolexatofilu.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/87399820968.pdfIn PDF document text
    • https://wecareprogram.org/images/file/muselusitivanova.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/69195711948.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/51664708358.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3dd2575ad---kukebisazosobagob.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4f3863f358033bc5827cbd8c56f08bb5/puzubunaba.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/27146102688.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/33591945141.pdfIn PDF document text
    • https://magatek.com/documents/file/89889862188.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/waloxupidam.pdfPDF link annotation
    • http://hotararicedo.ro/files/files/60028204634.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/sazajonebejorilopaveku.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/92603078871.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a001a6ec89222d1968d860cce1c9b54e/ximufawezimup.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27a226a047---fipimil.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/mabegisusirofudova.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/49793580435.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/82064925039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=millman+electronic+devices+and+circuitsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/da4a5f47988097a5080ddf95325b4a2b/66929782561.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_off0000ba6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16664 bytes
SHA-256: a22071c6767919876502ff2599cc71f0bd6a7cada1b488ad30bc3c5a28665d3b
font_02_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10688 bytes
SHA-256: 627adbb55e4c3f9e0cca72cf0fe475e1d251f2b7ef16775377b449a71669176f

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