Malicious PDF — malware analysis report

Static analysis result for SHA-256 6287603ea02e3f2f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 02:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50dacff37ab7dabdbd070490f2497458 SHA-1: 17cc68475e9431f703b4e3331a3b3c7091ca65f6 SHA-256: 6287603ea02e3f2f21139e782c5f8b2aea40118a67f2c67622462c679d66672f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of multiple distinct hosts hosting similar file structures reinforces the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25785dec3d---66847758271.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/novabebikatowozotugamogaw.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e650556c---2524789598.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/59545050426.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/wowazufirejisopozediwaku.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/36237930134.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5kss5jq6r3vv3p6u5e569vbpf2/jozuwumazis.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/fesagopomixuwuzifid.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb037a53c0---76325057967.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160771fe0c1de5---zumubekasipi.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/pirikawixi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3ho0qp238rjp9hkmks4psoij65/tunedepogonibezuxulipo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c88d60171---nibaxarexabavojiluxukit.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rokafudodojitutogidivibob.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/65389258840.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/25828255936.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/91357449547.pdfIn PDF document text
    • https://egf.tw/test2/images/file/42563595425.pdfIn PDF document text
    • https://puppometalli.eu/file/23925613589.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/92g69h0t3bgm8i7isri49ir17v/8177223876.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/94927293280.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097916a12449---jopokomajugudonufuge.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/99502966683.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0q40na6tlte4t87uvmtqaoad6d/24430228376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reference+for+textbook+apaPDF 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 19640 bytes
SHA-256: 549502d0d0c1965ced03d2fb66b70ecc02fdadb570bfa671bf8381843321b746
font_01_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 10544 bytes
SHA-256: 1f5c3d1fae7835ce7bc743324ad03786843679c01465fc08f16bd2b9df4da547
font_02_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1