Malicious PDF — malware analysis report

Static analysis result for SHA-256 195701d2804d56b7…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 01:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ce580dffb8e7ac69ad4f6d860a13e22 SHA-1: 96d9c6b23a1c820ced6f7cc59925019e534beda4 SHA-256: 195701d2804d56b780894b20a40a7f0a9330137bfcd0c400cff0685ccba55aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=realidades+2+capitulo+3a+actividad+6+audio+answers PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160707e3dbd9ea---98541556501.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee42a7512---23681156640.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0f9633d---xemerazuzojovovabazaloge.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/edef759e8e1306cb2226e2d768932c9c/27818899534.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/pegunafarixigirazibati.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/rilaparoxiwaxulugutin.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/837db6ef0cabc7d0c80e6197c311355a/derowugitezukagexoza.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608879fb31c1c---97527478713.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d723d14d---82615696759.pdfIn PDF document text
    • http://didula.com/img/file/jomib.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/96077733301.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/13632492699.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/wawuxikaruna.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5eb697db2---vavatodi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608648df91389---tetunutafivizelenibip.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5eab44970---duvigatelubilirikakime.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/mawozub.pdfIn PDF document text
    • http://ridendo.cz/files/file/16820288299.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160eded916ecd1---beritiduxiwekijefutix.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/72695915618.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xamufulom.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9918b4fb1---zaxesawoman.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610999e684c74---76443885211.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/10662423043.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/40031638927.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_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 11264 bytes
SHA-256: 1e5364f9d3551267e192fe724459ef373f506031c395e15edcdb805defc8c6eb
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16388 bytes
SHA-256: b616a94d1903a80de2886ae9211e758e16c1e108308e0678610e9285f59d1299

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