Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dc02717e3d1fed…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 04:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7eaf17b6c3ed9ba61c8d4cf5ca053ff SHA-1: 4527b5efd13e79d34911c8b6b3f3f70da7b35e6a SHA-256: c4dc02717e3d1fedeafedb5bbe2e2d5381ea95f544ddbc8fdad32afe697dc7e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/adf81063a513737d1b26f12d980fb04a/ladijivuxidujaw.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5789bca59---39407212438.pdfIn PDF document text
    • https://buka.ru/sadm_files/wupuvuvigefipisugazidaj.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/22376314927.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/64046202227.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d815aa83e96e53e70cda8e9bf154b3ed/79478384823.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/xoroludupib.pdfIn PDF document text
    • http://zenithmetals.com/files/wetapisozelomegoz.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3faeecc1---lisebajivofa.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/pezefuj.pdfIn PDF document text
    • https://paperland.bg/uploads/file/58447868116.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab794429525---dadigowefe.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/14739785957.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/97fbee6105d3ddb438388d87845e9d7c/23954787171.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/mixewibarurevej.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/165c493db625170c4ec1a3c8a5d363de/xizefikenuzokive.pdfIn PDF document text
    • http://chinahongji.com/d/files/68776172732.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/rudonatonotelumagevamiw.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/99135577516.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e1318593d3df7f4b70730f546c65c3e4/reririsadatejulureletaki.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/45086282092.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/55701850965.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/kkm0sph45tv8ov33rp95louaqi/tinugewigawu.pdfIn PDF document text
    • https://todayshomeownner.com/wp-content/uploads/radio/files/2019/07/bnp-string-In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dewalt+flexvolt+string+trimmer+manualPDF 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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 19864 bytes
SHA-256: a180ebc654a96c78fd1ceff6384a158153a6249bd41c1ae8532ff888b127fb0b
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 10912 bytes
SHA-256: bf123f376aea8c0ccce6b976420a23763748b83f5dc3f2fc8a133dfd5b96f3a0
font_02_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1