Malicious PDF — malware analysis report

Static analysis result for SHA-256 969ac843a753f831…

MALICIOUS

PDF

131.6 KB Created: 2021-08-12 13:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6934c1a0db5fb3d5f1f9e1b06d7be43c SHA-1: 806e872810babaa1d1481205412f7e923988efb8 SHA-256: 969ac843a753f8318b999a8008c470ecab77bfa5bd4983617b50b46104b94878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hhe81mflplful8vu0qs0fdaqml/95500832198.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k8h7qojslgqejt0r5tqldakhos/88155516827.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/lewupitamujokuva.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d326a409ad244835862476115bcd3681/veboxosofijoj.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062023545863.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2b71a3e22eec6d2857092b73c269e309/mavezatit.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/doziropovit.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/55362795168.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q00nsc7n1nk33tk62d8quo2lc0/59646580971.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e7f736b24---24960210104.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/30133749708.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9206a097815926548af23088f319c59c/82557100429.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e0eafe07a698ca56de9175d88cc20c87/69826734407.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160db9c205e281---41400752693.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/55578989901.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/60016555178.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e1128f76---xizetajodafivov.pdfIn PDF document text
    • http://amdind.com/userfiles/file/26925283605.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/xizapovewixovoxus.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160870dede86f6---dapowogedevap.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f145b2b75342bbc712063c1a4d6aa328/xixuzamadujunepe.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb4e54fbc0---34708787447.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/42203546261.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/75817272663.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862671fd7f---gedotixeb.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/44821590597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manual+de+seguridad+y+salud+en+el+trabajo+peruPDF 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_off0001a03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A03F 11044 bytes
SHA-256: 1645b82c9e30614236e1e6d0c2bc835c995ca5b2c3c6d389c10ded939ab70891
font_01_sfnt_off0001b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B996 17504 bytes
SHA-256: 542796919b12bb29e73f7e3ec41e5036347c8f255741899dd2b5785b899f37cd
font_02_sfnt_off0001e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1