Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c3095db9524444…

MALICIOUS

PDF

87.5 KB Created: 2021-08-05 10:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29b4d3487f228419464bfebbd2bb5b40 SHA-1: eeac695228f0d435a33f787e75769bcb23ef7c66 SHA-256: b5c3095db952444479fa5b7cc91efe9a7dd840f23db2685fe90985e585bb7440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=synonyms+worksheet+for+grade+10 PDF link annotation
    • http://chinalabware.es/d/files/linabomafesawasusoba.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caad88201a3---4723366328.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/83316752279.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jumofejuxasepela.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/240953e1kfitenl75i302vu666/fogavuvejinavoturilop.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/75792238536.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/sulowilubafirisegomotiwe.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vupazozafademezipozag.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/75680086959.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1a486baf65a4958ae32175875fc8f0da/11919254499.pdfIn PDF document text
    • http://ahchala.com/img/file/zewagofefebovegunubufotif.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/lagarutavopavonese.pdfIn PDF document text
    • https://blogsma.com/files/natizisididejugelabini.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/kemakoru.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/6496359830.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/96233236448.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/femusidejefefasemegotowav.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ce4dc4d6---87477992241.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/gikadaxojurijuweloxokezo.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/e0db6557475f39d384306876ef60f854/jafisusumimuba.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082487da9732---tijinegizarojasive.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/34461161972.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/s8k6ps32mqhvmcaq69e0pt2a27/jerupowipu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd62e0a68---gufazobal.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16093af1128691---wadagojepidixone.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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 17436 bytes
SHA-256: 6ec6fb2cf8fbbac1ef871d852a56ad0e72988bf648073015d7fe3eddc52d4541
font_02_sfnt_off000134de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DE 11204 bytes
SHA-256: f72e6fcd67fc99cad286aabbfe8aa77ac3320bd60a2b50e291cc086c94651745

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