Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeeb38d567cacf3…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 09:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bbacbaee51cb8701e9528f661bb75ee SHA-1: a561f25c7358a6e45be176c79ca11c9d98a0d943 SHA-256: 3aeeb38d567cacf38233c69c876917251f475014ff5d9e9c0f842bcc948093ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a deliberate effort to obscure the final malicious destination through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://coretry.ru/uplcv?utm_term=how+to+rotate+scan+pdf+file PDF link annotation
    • http://konberdbio.com/upload/files/tewivolerofidoxigene.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/meriremobiteb.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/41q4d171augj0qov2is1rkdlel/34954291184.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/romigazezunazufodejopi.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/83086489464.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/nupaxipugijo.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/86576025984.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a18136487---gadiwejajozinenamunemozug.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613999ff1ff7b---tusozexibelitilomumizutoz.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1971937648613fd2e603008.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/tosovekupajipoguraravofo.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/tonakozabavetexeronito.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/31869170980.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/boguboriruxun.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/gagenalikofopila.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/pomogejod.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a243c7cd979b5760a4f0494366821edc.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161423c2535670---86015173580.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rijuzokenexaweroxoxulofuj.pdfIn PDF document text
    • http://status.cz/UserFiles/File/92418127430.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/bimoxemupagolotol.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe971ef90---mefulenubiludituruguzot.pdfIn PDF document text
    • https://jensbrode.de/files/file/52944627127.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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 10688 bytes
SHA-256: da7d33033f3bf5e9f7d85058f28f14425dc80b557fabafd3cf388816048199cb
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 17316 bytes
SHA-256: 6ff477d27dd9d5bfeb49057d1b7dfc9b4100c3f86bba9cba6cc639b7724009e9
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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