Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a4bb556f319f45…

MALICIOUS

PDF

76.9 KB Created: 2021-11-14 00:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 538e848c47836054a186e9dce03f0491 SHA-1: 2e687abe0775d885bc04c6189ce2f074eb6f8b50 SHA-256: a5a4bb556f319f45267de31dade4b47001abc498c75ec0195c9b97ddca996c55
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://effektfilm.de/files/file/80165701015.pdf In PDF document text
    • http://dyneco.kr/userData/board/file/gonisewu.pdfIn PDF document text
    • http://jarosi.hu/files/file/36127541100.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bimatitelodipowiwa.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/16318131714.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vezapatalubudoko.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/58dpje3nr6fmls8qk6a26hskqq/19674806963.pdfIn PDF document text
    • https://andana.us/files/files/94989352366.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sqtlbdisqjts583tr4g7u1qfpv/kabetividesixegavoligom.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/zuxurofutadugufod.pdfIn PDF document text
    • https://educhina.mn/editor/files/8540242504.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16157462a93e71---82429770358.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/vunaleminu.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/64207111931.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20211025120717_yipwbb.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c8838c5dd19f0fa39fb4bdf25db495c0/daganidosapuwepos.pdfIn PDF document text
    • http://caythuocnam.org/images/files/11642753938.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/vikuzujerafo.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/niseboxukulolezi.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/vovawuvavakitipegavebu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021092816552473499.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/92105925241.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o83p5gns1991lv0a5ueglstlac/kitojadugisawobelomilag.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=funny+quiz+questions+and+answers+2020PDF 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_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 10920 bytes
SHA-256: cbd42d68fb4ce0e68d9f591b31cce799e2a53d03b54d3b26102bd61c559accd0
font_01_sfnt_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 18604 bytes
SHA-256: b4b166e6112691632e8e14d88a0f79ab316f76a48d2e868a7154421b1ed0adb4