Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeac93435223cca…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 05:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd64683a2127c48103bb8de4aa2bd200 SHA-1: 549a647a5326290662d66052de144c4a0d1d3d70 SHA-256: 4aeac93435223ccaeff744edeb2063c05f2200e1fe20bbfc3ddffee6e4a3cc6d
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to external PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics suggest a tactic of using disposable or compromised hosting to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://at2-turbo-j3t.com/contents/files/dakabotufo.pdf In PDF document text
    • http://azstorestudio.com/uploads/files/19315672798.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/20941044751.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/1487379078.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/61272218310.pdfIn PDF document text
    • http://afro-safari.com/upload/files/37506335922.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/11558525000.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/feguwurudolaseve.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfbd50b3f5---jujor.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/xegaxumasagudu.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/88426792576.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/javufog.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/fajifos.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/22793643563.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210903070353.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/xowemotogusodanusar.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141a7890b4a2---35008294682.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/50803616185.pdfIn PDF document text
    • https://masukpt2.com/contents/files/zibapagevukigekew.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/65595532783.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b3a81660---21406165428.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/varoremotikumumo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/41105230930.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136fa4c9789f---31140483731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=stream+the+house+that+jack+builtPDF 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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 10928 bytes
SHA-256: ce7bfc6cc64fa97c6cef57d8e4c1f2c6a65ad3de52899ca508880a4d3476a242
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 17308 bytes
SHA-256: c45220f043811e67ad317999159bc264a98a721c373efd4fb1d1133b7501113f
font_02_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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