Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec94b4d2f3a4836f…

MALICIOUS

PDF

82.9 KB Created: 2021-07-06 22:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4e18c3fab04eb5ce76d6c6f0b7363e8 SHA-1: 79ccd566a59b829210c52e4ceb9f87704c6cb41d SHA-256: ec94b4d2f3a4836fee91e6a98ec1dc8eda045188d5537138c6742a8d8ba333b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f48614d16f18a201d151f9e95150e7fd/pewegon.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0b66e527e---7367297999.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bea9da2cda0---16347635862.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a8624f59---tavikitefefutobuwikudap.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2fe4a879---gakabemitutavozokulirebol.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5ac649213768315d6680712045abd407/68753789142.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cem41q6kbpts30ia23ccak1qjs/mebiju.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdf1cb263---paretipavilemedufoju.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/penufosuzafesurimopom.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/isrhjhbaphljccjno1o41801me/49389696318.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/luwelupupuzilogod.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/fumivawapaxowufenitewaga.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a7841892ded---64696213809.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/puwajuf.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/52594762609.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/72271498383.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/58842315514.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/sakogozorelapujav.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/bamefuvafidiregumaxij.pdfIn PDF document text
    • https://limsurempat.com/contents//files/buzasoposolirinem.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4309820ef494f5b4d8fc315f55ff4624/11957485545.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/53315405111.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29282541546.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609579259c5d8---texiji.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/287b3b92bdbe8b577d7106a13df76ff9/86569749199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=word+text+to+pdf+converter+freePDF 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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 16484 bytes
SHA-256: 6466b26f3ae071a51af9512ebcb42e44fae61b9badb547cc06b7529e742f9751
font_01_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 10308 bytes
SHA-256: 0cab335393df3d6bb05682873a20ec58abf8129612e6ae8fcc55ad73879ee0b3

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