Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2a3cde0d998f3d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-13 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3d197d31b6e137399b702e6d84dfd32a SHA-1: 36885b83fad324c0de66eaa79c96506cd9b261b9 SHA-256: bf2a3cde0d998f3da82c76035b8f66bd92b9ae5594a2a978090461d6059f6945
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://psychoterapia-przemysl.net/img/userfiles/file/jefevazagu.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbd83e5f4---73537099788.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e040a03c2c---7412697447.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/64029793380.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbad771f42---10412187487.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093455aa2eb7---boluwewagakagize.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077f764cc191---21812975466.pdfIn PDF document text
    • http://stylekd.ru/files/nemawarekenovumedimogavoj.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/58117221902.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210612054612956123.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/nejukugutedugafizibi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791fef34485---zejiwizelidolikowojivubew.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ctu71063gp93u11nf02agjirn7/27803270392.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/ganirinogeburawej.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d5b1773b---75165098733.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/82590454063.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/403a47768f53d3a995811032e4a36dd0/38665835651.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/78700883022.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/65010913482.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/zanobaluselam.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/eab3989b016f7d62f0b96853260ee72d/vodikotefa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1212cd446af6ac377d48479613b7052c/pogojajelagovimaf.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/tenagodiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=4.6+kg+in+poundsPDF 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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 17080 bytes
SHA-256: efaa1e74920ff591b8d64207eb5f5df12f4624b8aab2ec50d37e579c03841535
font_01_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10436 bytes
SHA-256: 3d6b2c8c608f70f93aec3e3aac5817b1a55921aedb83057b1085f7d53c06fc99
font_02_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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