Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7513f3832b46129…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 03:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7eb1f678193ac21e5ce6a24fbef97434 SHA-1: 32d3e37473fc194133810901d6a9d97a3c30d75e SHA-256: a7513f3832b46129936eaa7a2a320d85d85334050d231c0079a0453a0b2f98e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable domains or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=canon+eos+rebel+t3i+manual+espa%C3%B1ol PDF link annotation
    • http://menafundinfo.com/userfiles/file/63420594142.pdfIn PDF document text
    • https://flomogroup.com/upload/files/xovejokubatibimo.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/gipekejavikikubavefowat.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/nuxuzukosotirewitiru.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1c7d659c2---filek.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c85ebc5dfb2c2bca302a4f009bacdb90/15573444196.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/abb06dcab52b71513bd4b1637e462f20/wesixo.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/61664588098.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/50859152910.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbd9b7acd---89493964689.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/ginenefuwozuwutu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/morowagomes.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/sozovoruwokumisanofafex.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1629422317_1.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16072e63701528---lijitelopivik.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/65030957424.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/t5cj745k2e237f6m6rvdogilst/zajiwefomatijikobeb.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/zaxupokajosu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b89f16d8---37720942651.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/ridapunoxogotokimet.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/luzoxafugukebesizopesiweg.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960bc3952c5---31808222528.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7959041c04---97568353846.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/oin5gc9hhronljr7aou6hdoq8n/21702219606.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611509e85b494---komokazawesunirubagidutul.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_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 11064 bytes
SHA-256: 1728dae21fe64777282fbefc0cd415c28c7ddfa33af1b7e27c14a1d1287d56bb
font_01_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 18944 bytes
SHA-256: 5e6ddd5f83d76e9391144356c2115dd8fec9d25c2cec0bb7fae00ad28dc44165
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1