Malicious PDF — malware analysis report

Static analysis result for SHA-256 472f42a71860fca6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 04:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5708525d81a24eaafd780bf1255495c0 SHA-1: d91ad43cbd0ebce7a5d1df261ecfa906717bcc5e SHA-256: 472f42a71860fca66d87266edcaba7dae088602a1fc0ffba5e20fd321248dabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://drafthe.ru/uplcv?utm_term=el+mejor+diccionario+biblico+para+android PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6c6l52bg5jmjvdvdl9p5vo6mv3/sazitejiw.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/7559318785.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/58965814777.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/sejameturiboxe.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/wikemaxoj.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/fojedusim.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xedavubotes.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/fidizeloxezuxubiwotu.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/pavijusatipe.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/48838162782.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nusovubenobuberubonuxoguz.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/dekunakitazow.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/xogoxugomoboduki.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/79512552752.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/65263331302.pdfIn PDF document text
    • http://minipit.com/data/files/37305960449.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d2a230df87d8ae8af0e82f426ef0273f/96558996653.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090310044073499.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/26447997764.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/kibobupigulepazi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5c458f7ddc39ee8bf816dc32d8b93e45/73577608383.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba47cf0b31---32495063684.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/buzuzolapididulav.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/74955526864.pdfIn PDF document text
    • http://ty-int.com/files/files/77070871791.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/45749325323.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_off0000b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 18964 bytes
SHA-256: 6f3750514571a62b00033a2aca4ddb9420d675c3e9a878d9386fb5a0401ccd0b
font_02_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10664 bytes
SHA-256: 6db461c503df81ced100ea51399e9d9471961157e71bad40754c1428b068c7fb