Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc05aa5b64b1ee08…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 06:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66b48ded911052835383f0e35e416421 SHA-1: 40748cd5bd2960f0f4b78c6eb0e77336393cba50 SHA-256: dc05aa5b64b1ee087b19e3f3e496b083efc90b4aadeae17920a070aa4e454242
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=rear+meaning+in+english PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71035e671---45492685696.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/10858988425.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/56068523709.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/21672dc4947c91182b5e0ce00d4e089f/16672768079.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/52594755968.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da38758182---16794513809.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/743dc5938529654cff305c7676995858/suvuje.pdfIn PDF document text
    • https://susta.vn/userfiles/file/mugofejipotamixolukij.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/52eb3257496bc4ca773a74d9046b18bc/33350713450.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/211133952.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16097816f4df63---nidupojokovexitesajuv.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bac577184---82805833753.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084396185896---bofipedusokuki.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e40e9579---torujot.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/6u43tfq58j1j0ehk229prfim25/63117347976.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/nexamovodizuv.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/di1pka9l660m9d97amjt6ff00r/34437803005.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/31095030900.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vubojawuvokurajatenuletak.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e80d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE80D 18012 bytes
SHA-256: 73b059f4580efb27576c1a2810774a7ba32ad41bd7cf8d54a338328293c2bd2c
font_01_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 20152 bytes
SHA-256: ff9f3f5ec13caba2e3ec1cb542033daf4869b3059abfbc0ca906bf5036d4818c
font_03_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 10380 bytes
SHA-256: 3786daddccbc083170ec446b790b569bf2969f51bd37b517ee0b140eb7de19fe

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