Malicious PDF — malware analysis report

Static analysis result for SHA-256 a336744623a3ec62…

MALICIOUS

PDF

92.5 KB Created: 2021-09-08 08:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62374c737ed6bf240acf5d4dea2a5a9d SHA-1: 065bc7e9acde17d2728a4b811282f3b4f35e11f2 SHA-256: a336744623a3ec62b81b2fc707951a897313929b6fc3c23ed13e632d903b76f3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 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.
  • 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.
  • 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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0efc8cab87f1ce298f5bcde2d685cbc1/potimewodisagumuwar.pdf In PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/26758290611.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/gopenuxijixudozezaxolas.pdfIn PDF document text
    • https://airshow-bg.com/file/34929685726.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xesovulifu.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/vipikajoliji.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/72221705133.pdfIn PDF document text
    • http://arslanemlak.com/E/file/73095713910.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gac476t6pk1brf91nff2miie44/3300494954.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee737e4c55---vobilowilagonogiwoseju.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/onf4ipiob690hdk1gl5jg24rig/jagifiju.pdfIn PDF document text
    • http://com123.vn/uploads/file/91223047022.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed04855731---jojunijokesof.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c51ilks30h39bn2g1v0g53nirg/87629175894.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/e274dc126b4bf72c93204fbec04e86be/penoxilarobiget.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d68e462a55b---52098195850.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/wupipezawimozimafu.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3af29778a6167c4d6f92a8d47bd0c37d/depojikati.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/dawabonadin.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/zuluwugenasowaro.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/17326307549.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/98233042548.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9b0fead3c5887a0bcf0bd64280364548/74299937911.pdfIn PDF document text
    • http://camonetinternational.com/files/file/fupebipirevijanonur.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/ziradow.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/penokavewumonetutap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fruit+of+the+spirit+kindness+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 10640 bytes
SHA-256: 207fa3a38a51dfb6d1766d46759bfda533fbb7d198f1560a094b07f4aacdaec6
font_02_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 19532 bytes
SHA-256: 76030b2811eebf75a37a88ea9dc13b723eb1ce78b037e441a008fa9b69c945d3

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