Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d68017cc4f4981…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 09:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bea2bf1cb9afc27a157c43eab03bc14 SHA-1: 0d4baf06bfb30feb825e2edc51dd14f7bb4fda85 SHA-256: 81d68017cc4f4981349012c4596f753740e6f2371db04191e0927ff1c6286947
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/8e7475a778bc5f81eab89ad315a09764/fatadixifabasujovapi.pdf In PDF document text
    • http://usagimatur.com/files/others/zikoluxuwiwum.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jisizajotoz.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tipagakitodomewukig.pdfIn PDF document text
    • http://maihome.hu/admin1/file/10574230950.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/91082322447.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/30050107476.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ribaxuxedevijural.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/kavakufijetemomo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782dabd44b7---41501339713.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/tukidivajibezonaw.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/64117d71a0da28781027b71a8fd27e34/70178778619.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d255b41632---tosibala.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d0dd9025---72713850429.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/fagananifalimaredawadad.pdfIn PDF document text
    • http://zzweien.com/d/files/1048728848.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02414c451a---24468807240.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/bimalimuxumoragopigage.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d38ca84c---76689819724.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160814cc718937---21103421482.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/mitumomeropusakojexux.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/42533670853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dash+diet+ebook+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 18128 bytes
SHA-256: 7715d75245b24e040ed1231952e48927327767d835a6d33116559c255ad15c1f
font_01_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 10576 bytes
SHA-256: f9f202d7dfc37a68ed19d972e4d4952430d921279c3869a822b5c9c2142fa830

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