Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e886141e246a618…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 11:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f15315f950742e477bfd6cc33604721 SHA-1: 09d8da86a42009d91b403d169bb5d392f3577928 SHA-256: 8e886141e246a61893cab5b7f484e6e5f96b2b41a883f44d25e8300a1a92ebcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which host other PDF files. This suggests an attempt to distribute malicious content or phish users. The presence of a high ML score and ClamAV detection further supports its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ltssinternational.com/res/wysiwyg/file/mezukakegetirunuf.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134985895f93---rujupilugamok.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaa156afc---67554625693.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/ruradamabonuseseponip.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/55298963772.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/buwuxizasadaxaja.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/34773523507.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/1601a9ff2d8660e117fea981d97c2e2c/jopizokaxofinisorewun.pdfIn PDF document text
    • http://w-mill.jp/images/file/perataradegategujodativ.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/46647785337.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/foluzukafuz.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/93929972324.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/87293386340.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kogujofinozokivubufopag.pdfIn PDF document text
    • http://tulga.ru/editor/files/88633782795.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/forimilugu.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/bobutov.pdfIn PDF document text
    • https://cartolmania.it/file/zikepovixo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9942e33e---kemulivumor.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/jeginugopuwajazi.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/rugumorosamuj.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/80759306968.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/674319f0ba29efefd3e88fc8f7a24a8f/malutojubev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+call+unlimited+credit+mod+apk+downloadPDF 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_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 18836 bytes
SHA-256: 60640796a1d1fc43fdc1e38ebddb1c034b05c99647a0d8b326f3d9b1cbc4a060
font_01_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 10764 bytes
SHA-256: 3754c6df6626786a5146960876c1b821635964529c8a8dd4bbf7cd3d35c1d871

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