Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f06c1fada6070a…

MALICIOUS

PDF

125.9 KB Created: 2021-07-21 10:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55be37fc6701a5f2b80cebad48bb9ad0 SHA-1: 35e9a9713f56ad5955a87fdc620ffb5728d883e2 SHA-256: f1f06c1fada6070ad4a062079ddfe364cb1e3427b5ee1355b2d9e7cf9fec1fab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://catherine-massage.com/ckfinder/userfiles/files/77014822057.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4936b030---45038816263.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/faruverepapirolunatafol.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/pefega.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da569a31d6b---kerokizoj.pdfIn PDF document text
    • https://parc-hotel.info/file/xovilam.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092041ed316c---wexebuwetemiwog.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/vfo7oiruk5cpqcekvr42jtubfj/xapupopabavirodowiteronex.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7fc0c964f---sutederemaso.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/12262326003.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/64654520844.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de2bd5fcd---52569865783.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/34140937642.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160816fb27b168---44780510298.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ed9e0861---nesijovow.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/lapima.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/zipetenurejeluw.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/70442894918.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1e45bbba352d712ad7914a69ca904ff5/wikujebuwazuruf.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a285eb2cd68---67877194092.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kagitenupotumapumemosodig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ecology+the+experimental+analysis+of+distribution+and+abundance+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17975 11504 bytes
SHA-256: 57e988d1c0a2541b8386bd7c3f4520e1edada587c2fb6aa2c5c57fccee973488
font_01_sfnt_off00019426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19426 20160 bytes
SHA-256: c4e7aad9494b043e8b970ab72db567af791d7beed9cace102f2e81c512c383d9
font_02_sfnt_off0001c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0EE 1724 bytes
SHA-256: 5b68e14c25a8fd0333afc241be4cdd6da0a5133f0171feaf563e2df0cfb92705