Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3b761893baad0c…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 16:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9f61980e164147d459f802aa5921bc02 SHA-1: dec567567fe05fb6e2a500b31ae214e281875eaf SHA-256: 1b3b761893baad0cdc5e595f2ff6ff3ebdaf6f3cd14eaa531530712705ddd0a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious intent, including links to compromised WordPress sites and algorithmically generated URLs, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content, likely exploiting a vulnerability or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=20+as+a+fraction PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/09b01d4bd358850f26d687090890ca3d/79011358512.pdfIn PDF document text
    • http://klhl.com/userfiles/file/difenobubixu.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/87274027043.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/g74de5ts0q9tq4amt7g5j4flda/59397073439.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/77j1r2suorlgtocodqgqaf8807/loxafimegevotovajoro.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210505030410.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vajefona.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2070fdfc80---fulirezobiwajeketaxawavu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zusipadenalokupisova.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd8ee0455---23774108929.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0d218b2ab6cb2ad58315633ffd10cbd2/2432305986.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174555e225---vidadavipukelisoweb.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1a426ba5---29326190543.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2d18dab8---62949650918.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074374be5872---17754254765.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/noliget.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbdbb9fbd3---98402833961.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/kitewaxibuj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0c1e723d---3440827828.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kexodojejifaruv.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/zezobexa.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0cd2611cf---zimojevujinunabikarofuju.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5352b05d---26285367370.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b95cdf19---lurekemav.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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 10296 bytes
SHA-256: 26a358ff9642dde342b1765a90250be3726b68a60580e7cd504f504e418b3b9e
font_02_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 17452 bytes
SHA-256: ac5ed8a485bc41ff049221ecddd992484e6fa6473b517f61b3008bb8c7f0128c

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