Malicious PDF — malware analysis report

Static analysis result for SHA-256 273158a35bcadad2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 11:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a9f94f18f8051947c5b7aab9e6c628e SHA-1: 18b63204f80a07f4dc78a12995bbffa02386cb20 SHA-256: 273158a35bcadad2ea84060b91139e31d5853f561ed63e07ce044401203ff6e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://desiaussies.com/ckeditor/uploads/files/gezixiwulemodefev.pdf In PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xidapi.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/8844664956.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/pofuja.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jopubuduwutofiwamun.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/nuxajapenu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b6f2752---4661006620.pdfIn PDF document text
    • http://4darchitecture.org/img/all/mefanutesefuganatatixak.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/42113856398.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e1234f64744dcf34498c7635f4688c82/zexuvazuxagenematatalini.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210905134709.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/31327368193.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/60979023184.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/83759981596.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210909_78EF91DC5AA9E2E8.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/48276412054.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wuluzonuzike.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/nivavarabixuk.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/58dd7149513a71e2b9c35ec38848f65e/vatopefozatutul.pdfIn PDF document text
    • http://gewald.ru/content/Files/28171634877.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/97608613083.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/vuguparuroko.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bebazinigawawi.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/17489146963.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140024e999d5---zevazisevojilefetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=brazil+vpn+mod+apkPDF 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 10424 bytes
SHA-256: 220ebea0999da633f86ff0cb7d0e26730e77ca3a4ed74a19c8391aaf5f4541de
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 17528 bytes
SHA-256: 2b9e9ecd2a5a2af5589506f277469b5884de979aea0eca47a1adde6aa0e040c5

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