Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80020da43db86b5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 08:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d4d23b7f4adb69e6822101b10497f0c SHA-1: be67bcd1f098dd6c9d0b206f289e7a57799e58df SHA-256: a80020da43db86b5cd794b43c413c040a6de23a26ecaa08eb890f87282e5ccf1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=sao+season+2+episode+3 PDF link annotation
    • http://mtsskzy.com/userfiles/file/19404918781.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/t1krf10pobk5854g12e6aubitc/22163615943.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/72490506759.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/61763282313.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/vulitotipuf.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/zusadazunewobok.pdfIn PDF document text
    • http://yongqingtech.com/d/files/miwijebipulasolozamaj.pdfIn PDF document text
    • https://fond.ru/userfiles/file/juluzubewemitupetirexan.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/roredekolov.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/morodotemopejofupekafero.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/bapanajunanodubagatuwusu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/036ljkeqbe63ena1q0n7ga7gj9/39319990444.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/69238430298.pdfIn PDF document text
    • http://teplospectr.ru/images/files/5986595179.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b64ad1f98---97665910090.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/pewidulowumopitafem.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420846aee08---pojixujaniwujumumevex.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lolemebozivuseda.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6l7f5g09bt4m7vhq9fllg21hs7/32572838024.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zonadilux.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/mopadesil.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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 10508 bytes
SHA-256: f269e6fcd88b689c7c38ddf84207ded83dbffa861db7e45ead1e44ccc85d710c
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 17880 bytes
SHA-256: 084f9012d1f31c335601a6ee70e3149eb38127cc7cb6ec0947a9569b0799f42c
font_02_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1