Malicious PDF — malware analysis report

Static analysis result for SHA-256 223a953ad25ab981…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 21:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 96bdab0b4d13a9e2dcd39197241b40db SHA-1: 6c5f82792bea9496cd3b24d97eb5ed08041ba451 SHA-256: 223a953ad25ab9815e0a050301b4481539d597fee7cf91767b62dad1dd260588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://alimentosldm.com/userfiles/file/28125077761.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13db891de---31582821408.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e203e19ca---gotutiviwo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1798b2d17---babezotegepuw.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///3655250132.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/158268766260a005e0cd164.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/41850966338.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1084a65b1---sonikizorapavajun.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/17281331771.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/vesejelix.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/17466219733.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade542c1148---jadujenujajojunajatema.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ded4542c---gazumireraripuwelakawef.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c322311866d---gujojulavalipuzebaz.pdfIn PDF document text
    • http://willbramephotography.com/pudodaridiziwamusekiruvi.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/ririlabutevozepagalufa.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/vipirovidozojuf.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210616075415.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6aac1facb---satotume.pdfIn PDF document text
    • http://starsunited.at/upload/files/23986271014.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a06f631f4a64272712ae25a2d974c3b5/kusizikotozufazujesukat.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/431fddf554043a4adf6dc32dd636d1e9/zedetoludovodigodexakapaj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19b8a0cb0---51760935561.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092c440db395---36619518848.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210726054545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ejemplos+de+oraciones+objeto+directo+e+indirectoPDF 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_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10928 bytes
SHA-256: e976fde55596a2ae6b05db2624ddf9afbc3e4c44731a5910ea6fc0757b36e84c
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 17640 bytes
SHA-256: 45ebd6d9c54dfa18547e9fd83ae002789c04932f35a996026d4b307ef81bab49