Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae99aa33f5ad494…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 03:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a71ee436bb02c375e1d1d06360be048b SHA-1: f9b98735f5638568fe2d984e6a6b3fa45f05bae9 SHA-256: 1ae99aa33f5ad494b6d509814459bf1a9e87440920fcb2eb2f59dcaf186a9589
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=gta+v+apk+for+android+without+verification PDF link annotation
    • http://skrutit-probeg.ru/upload_picture/file/palax.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/63263064362.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/mazosibexozetuzirezelif.pdfIn PDF document text
    • https://nexapos.com/upload/files/40711356259.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/guriguxeseratudirige.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3c561b4d260f6a58f71c5063d3f80831/xerolaleled.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tekofazovon.pdfIn PDF document text
    • http://inica.org/files/file///lojusefimuzipepejaguva.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jusoris.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/wewobu.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/89372137053.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b05f83536d---napobekuluwif.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/21171904ed8f7e5c366321b77b42f40a/13476599605.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/87212644190.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/63072756975.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/07cc4b3c392cd86541a0021297432265/65563389211.pdfIn PDF document text
    • https://2acontractor.it/images/file/potikaximigajivonawinoki.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/sobezewemugiseba.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411bbf053d7---31742107612.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/sovip.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/96648424649.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/59570089946.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/71144365485.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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10884 bytes
SHA-256: 44dbeee7b776aa64a22e9f8fd76a5dcea77b18913576f544b42136c12bae073c
font_02_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 18404 bytes
SHA-256: 9177f1c7d022aade7a67a23bc1e6cf1672a1a12ce88c92dd2057cc5905d01788

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