Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8d939f5c5a261e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 05:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f8a3bc1d33556f1ed96e303430e071d SHA-1: 6b742a42e3a31625efa7a4bf978f0387cb9b8a53 SHA-256: ee8d939f5c5a261e317f7ddc963d895844ee9bb6c373a16adf757d706df82d5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress uploads and disposable hosting sites. These links are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=android+phone+as+webcam+for+mac PDF link annotation
    • http://f-kcc.jp/user_data/userfiles/files/dokutu.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/dojomugefujavaguse.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/85537854864.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109110645131693.pdfIn PDF document text
    • https://motecx.com/images/file/55022615888.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/takavofurepivapupozekaz.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/xepowiwimizufevamazodusi.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/jawenaw.pdfIn PDF document text
    • https://simorgh.it/uploads/file/76762182984.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/4931456720.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/vopovumiziloxowote.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/soxurafivereniduxuvapu.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/fuzofabugifu.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/xonajumivixuk.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef6b3c12c---82001720409.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/tunatidirapekef.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/kulaxanazaxap.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/bipemevupurokuxago.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/42954724278.pdfIn PDF document text
    • http://linker-apps.com/files/rulofozazamonokamijopo.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/83474577653.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/rukixijogojumixik.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mvrsekj4r3hr5op5222uan2nl6/551915066.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/vamutukekatuni.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca43c4b2b---28838822198.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_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10948 bytes
SHA-256: 439441e60cd01503cf8efcebb17045b4b26dd0a9e6cd7d14db0cd60036ecbf4e
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 17620 bytes
SHA-256: 330f45a9de7fe61d7ca6d9273b918c89c87c893ad1bb10dd59c0242662f0227a