Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91febfa88b52958…

MALICIOUS

PDF

85.1 KB Created: 2021-08-21 20:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7980cda63cd40e0f77e0b487eccc427b SHA-1: dfc07f49ecc0a064eda0f20bf16a3afd537976b5 SHA-256: b91febfa88b5295847a6e3c67681a8c31f97d9da384a1d7e2ea22253e013673d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mauspro.net/upload/files/tutibumaduf.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ce5a8eaa24161fb7802485c1f59c7f9d/mirefarapopojetizifudilut.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/juradezimujofikekusafefif.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/6246964627.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/rujiwirosek.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7a74e0dbee42bd36f0af2d2d92044349/93976892351.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/dazoxirigedizenemide.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/50668968686.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d453c7662b9ab497ef1fb45d61166d4d/josekiluses.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/bejugilufum.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d3ac64ba92e7cdb559c13ef5cb7a32d2/zixijataro.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/u77eqelil57g3ook0jood4iv4m/webivomajapobikefubuwebi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/numuva.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/87222820388.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/76895103819.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48577908171.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/duwudamofipikawe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b6af053c---62513447330.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jomapugis.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d28b4f6047e0fe1e804d0101855ab77d/78656503786.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/norubelodenuxosip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+spotify+songs+to+mp3+androidPDF 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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16836 bytes
SHA-256: 479ff629b45d64cddbf1bfdb69feed23be5dc442ff0cc9cca17024ce175682b7
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 11072 bytes
SHA-256: f6acc350cc313a4920edfb3d4e57e96abc113730f7b5a2af3d817a51d790ba72
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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