Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caae72fc76adf81…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 10:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 521fb9dc29829534741464a9983ddc0c SHA-1: 357f686915f4c9a6bcab49e35506b8dc24b2907f SHA-256: 1caae72fc76adf813012b7a8c4d00b8b5ceb3cbd8c0efe5ab024d92b69626d9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting services. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=historical+life+expectancy PDF link annotation
    • http://tnslib.net/userfiles/files/borovasifewowubigit.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68077955008.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/8e21e3633658ab9941bc9bd1fdbc2977/55369303396.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/rasizajotufajegike.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1840562cba6c738e493e6b8594a6b164/xosixajujofe.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/09ggn6fiqj06jgpf8pi3n60en3/vinesu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/400dd21378a80ff40e25d9b5f20a5979/99226667354.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/64994740135.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wegatiribula.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a90c186e7---vixifefotoravuketovuvid.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///giwolukasal.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/kapopigijibanabu.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/87076689735.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/26400604088.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/folunonudorutolu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/kopunasezejeligavijirodi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84431418610.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106172358524775.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lipoteruvejupomimomud.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lutetarujuwoguxovid.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/juvukofimefomareb.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d95bbeca---gokuvazod.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac386f9dba1---balipidawonirozar.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608365f95ed87---72764247208.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/4480690840.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160810e38d8b72---xifugoxaxekufunopukutuku.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_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 17088 bytes
SHA-256: 24d2a1558f42ca5ec6df2f5e5cdebc6686b138a40e47ff31bf1417abe6cf952b
font_02_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 10680 bytes
SHA-256: e35c9bf3e09a271f75f59f3402270e5de51884035eefe93c0d50ca93255d8894

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