Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29f4c9fe86d5a28…

MALICIOUS

PDF

88.0 KB Created: 2021-08-05 14:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27d08741b99b67e98afe38a4a22871fb SHA-1: 7f5779e05a16284fdb97eb8d70cda619fe1959f7 SHA-256: d29f4c9fe86d5a289724dfdda9d5f42bc1928c903f10a605744c01cf5eb23426
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content or phishing pages through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://queure.ru/uplcv?utm_term=substitution+method+calculator+with+steps PDF link annotation
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/2enobm64moi0qfeqldmad1guk9/perevadoxosalamatadu.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/53652807270.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/64156296299.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/wifufubusawix.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/bazipovonatu.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/powekisosi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d9fa4900c---regikavadetowudogoxu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2a6046d3cd5740e3eb6015b04c204239/48711205914.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca83562b25---jegafubenuxenufow.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/vovifida.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/negemodalubugefivit.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/3357686722.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0de2d40d2---dozomad.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5d7017cc---kesilugubesamapuruzoson.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/15785261780.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xemonisiretugeteme.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de8762bec27---88078880884.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608251fa23be7---48355886065.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dp1hr37v82dipseodtd70iq88t/mirubusezozeridu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pfr34c7bh27lmhri4o926un6er/95323995095.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bl3a8j4kst754rr8mqft0d94r9/bisisiwutobov.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cc032d1e---suresebalodiror.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/db73242817a0eab49cfc2c154b96088f/vixosonijasokafizadamer.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/8930047427.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/44739407447.pdfIn PDF document text
    • http://mutitar.com/user_img/files/69672664723.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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16712 bytes
SHA-256: a48781a23d168c090f563d18c51f46a04e89fba0527a8a952e022a6424961cc7
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 11180 bytes
SHA-256: 8edf6fba0883d154f56eebecc65f9ee76f4d0c388739be23a64650ca91fb1dab
font_02_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1