Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb0cf7b8f389216…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 22:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66408a09a1f20e8c9e688c481f8960a6 SHA-1: 5f9e70abd076b6327a796823deff3bfdd6fb7e2e SHA-256: 4eb0cf7b8f389216a91aad703fb31ae42179c899284daa7ff44a3992025c2d8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, with several heuristics indicating these are part of a link farm on compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs indicates an attempt to redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://paramountswimwear.com/userfiles/files/44815264105.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/12061282791.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/98129392678.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/93568085428.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/75746712616.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/dazidagikojaturijetuz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cac6511a1---daxugek.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca13adea99---88728864476.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vomekasozugaw.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134efa6b2e26---8324132972.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tuxol.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/woxapad.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gusuxo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/busitefarewojezi.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5fced69d5ad46126a10cffbdc442a73d/vopudagepit.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd159a36f---78685298604.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/boburizedisuvoxo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/e599feafe1bf31c0fcd690d073be1705/novonebanavisolit.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/23182917193.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/26248782904.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/naladobo.pdfIn PDF document text
    • https://red-adlay.com/upload/files/11020720750.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/19163388118.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lorebosikewidawijazujejas.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njr4cm2dg4a69karrko8gq78c2/mugipajesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=swipe+to+open+androidPDF link annotation
    • https://mediaget.com/userfiles/files/gelawabamagakasixonoze.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10332 bytes
SHA-256: 1eac1503c43d517c4a6f06d4e2b4c4730330fe516ebeee1c7bf6d684ab0eac2e
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17664 bytes
SHA-256: 3095b83bd21e7500f22b4cce08542370c76f9f894aa579e3fc35ea5d85173d73
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.