Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4369516f51f8da4…

MALICIOUS

PDF

72.9 KB Created: 2021-05-23 18:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e48c4c00f791d79f2dcb792a8053681 SHA-1: 81c4094260b7b42ffcf106701bd6a2d880219b4c SHA-256: f4369516f51f8da49e5969adf6bf152b39d16b7e724d5a2cf0d874c0ff3b28c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=how+to+add+sample+packs+to+fl+studio+20+mac
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f224c78b---wuwatipotapixixegapimagur.pdf
    • http://asiadomainstore.com/userfiles/file/9545766116.pdf
    • http://alimentosldm.com/userfiles/file/voleja.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/d59rovm4hlnjdp7qnecguqklm6/gomidogapafadixotimeduxar.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096107c97776---47807891468.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a785262589e---xozis.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae6303ace---zaretezajaru.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/28179584375.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d818d7585---21389914627.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8190a0eaf43840ac7aae3694f0a2ed7c/jesulumojizukivigitumob.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a237717e5---26411856359.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0941a328df1ab3210986bdd657f32faa/gatiboduvofere.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828f25797d---xudukizivosowabadozefaxuz.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3bfc194cca6f3ff9ad29c707a03be3ca/mijiwaxufuguxot.pdf
    • http://ehomeforeclosure.org/images/file/turugulakebunumutavurosuz.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081209b7dbe8---88756121780.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739613b2c26---vujupepev.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/94803905d2955099a06f1c0b7494241d/73706269564.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/faac6ec7c8f208de7769c0d968d4d87a/94497951162.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d13d.bin
bc4dbcea148c661a8e6f4e3e93037dc9a0e5e3a79ee82bc02f6be1f2ef5e4fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 5372 bytes
font_01_sfnt_off0000e3a9.bin
d9cd78d673da6ca4d69839c25ab5a1a9105e724b84bc06ea48a6765e22eaf451
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 10848 bytes
font_02_sfnt_off000108d7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 4324 bytes