Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cfd17b11ab036a…

MALICIOUS

PDF

81.6 KB Created: 2021-07-28 10:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 897e987cc2be954ac8e79c626d49f4bb SHA-1: d7a58bf85b553f436a4d456250e006b885755e65 SHA-256: 67cfd17b11ab036a7280e383119cb5831eadd3d55060014cf4c2b1c65af36312
204 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including numerous links to external resources, many of which are hosted on compromised WordPress sites. The presence of a 'download button' heuristic suggests a lure to trick users into downloading a secondary payload. The ML classifier and ClamAV detection strongly indicate this PDF is designed for phishing and potentially delivering malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/33a1fc425a2059798b931ecdb93cc655/67248631427.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ddaed1a528b076d92f47adc50cddf0ee/92056689175.pdfIn PDF document text
    • http://korytnica.net/data/files/44358672885.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096f967e6ef6---nojogin.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a4529be4---zuzuparubalenuma.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/resanosufugupuwiwetudifim.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/20682927572.pdfIn PDF document text
    • https://magatek.com/documents/file/12863140237.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/471854834d76061a712c5bb81376bc07/tomebulemogeg.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/womepubafopufu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf253fd0---36120215233.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/88703789522.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0f051528---siwemonefakuvopovado.pdfIn PDF document text
    • http://exima.kr/userData/board/file/mixudevisuvadatuz.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/13272126898.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f2ffda03adaaa53de81cb6e37fcf7cda/51097349671.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ad32961465ebb61cd9f459001b364b1/nawizamopovawuvonugawe.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/44490320595.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6a8273d93e4eadadea335558913c4a7e/mufigekigeled.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/321944bb2d92e659a80083e9fa1d1d11/xoludadowipatakaxo.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/mumaku.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/dunotibeberafuvamiwopaza.pdfIn PDF document text
    • http://skupka23.ru/upload/m/47025816844.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/frrf40ail8vubt6c7589d7b4u2/sevepamalanebaxukote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stick+war+legacy+mod+apk+fast+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608519e5bef2d---53138140733.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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 11328 bytes
SHA-256: 2eb7db290dbedb4edfb2f409c335b8cad59c0610ba14d83b15a3f7794c0352d7
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 16396 bytes
SHA-256: 67893cf8eb13a0346adcd6387cca21692544a1b2820b9c8deeb9faca8b7d80a0
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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