Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9332cb5fe39654d…

MALICIOUS

PDF

114.8 KB Created: 2021-09-05 04:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0eefce7582dad459906ae67715c7b32 SHA-1: cf1a20a930ccb6942ba38cd5779ae7de88e52084 SHA-256: c9332cb5fe39654d29e9714aac2a60ffab06b7d8b581adf4da816c06e6021755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://smidgel.ru/uplcv?utm_term=activity+series+of+nonmetals+pdf PDF link annotation
    • http://strap.sk/uploads/file/65202261320.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e99de695a1---fulawirumugeludixuge.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e0346de356a---91617006199.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/59130367705.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/16923874189.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/nemoruverijufokebisokibeb.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1408abe2d568c646aab0d81ed0473984/jixidaxaba.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/nf14mlofseio17lsh7ctmr8uh8/sewubumalaxakobafebu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104b206affd9---61157976610.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f1694dec---44290822176.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/kutovilufomojemud.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f46f63894d---96411068500.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/libiludoxuvogalat.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/nonevir.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/simosalutalefawu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210607172309.pdfIn PDF document text
    • http://riversedgefm.com/files/file/jitazuj.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/xuraz.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/donagarinuluxenekomi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/vuputeduzokuroxobasu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e1ce1d9e9a5b9b9a3bcbfa1c98081de1/88732970757.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/nukesopimojavofa.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_off000157f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F7 10940 bytes
SHA-256: d83a0d0be2433c43a60b695499e1e6321116f63d216710e3990959898bff4f60
font_01_sfnt_off0001715b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715B 20224 bytes
SHA-256: 63f5cb8f6ee236c6ad4c604c03ebac4cac49fa0d3a69419ad7ca302aa5f75fbe
font_02_sfnt_off0001a58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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