Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e552d440e6f5b1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b49be04fadf192df495c2661a68567d9 SHA-1: 26e26c10cc150ac8a10b0b9976dbec5e77d47186 SHA-256: d5e552d440e6f5b1cac755b79822c1439646b5dac0ddbcfc6dd8cdc59e266b00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated, but the presence of numerous external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://unitytradecapital.com/ckfinder/userfiles/files/sodijigasexivi.pdf In PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/18479146655.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/51936069002.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/resazuterazopevuw.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/ratidabufeledo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/39786832676.pdfIn PDF document text
    • http://baove24h.info/upload/files/34782041185.pdfIn PDF document text
    • https://forssh.com/userfiles/file/28382605172.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/89878335127.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/siwulofufokavemexuvenopo.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/78984524022.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/21958407293.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/wonumumefijakazugo.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348d5376f4f---95140398894.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3021894381.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ecea54588eae53ce5b0464b4fbbfa91e/lolowog.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109061329573279.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xafabefolirafosojo.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/fulotos.pdfIn PDF document text
    • https://biocoils.com/img/file/badafozedatemefidigunu.pdfIn PDF document text
    • https://makenie.com/upload/files/kavepumulefivaj.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98832aab2---vamezivifozazube.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/bowosejewepisedexu.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/97524344203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tspsc+group+1+syllabus+2018+pdf+downloadPDF 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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 11380 bytes
SHA-256: d7acac3e4fd13e46d2490a66e5840ddafee6ca99fdf78c18ef7992f24be136be
font_01_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 20596 bytes
SHA-256: b74529a273a0cfe3c92efad7ab08d11821ed52b8f52770be53da721709c30bef
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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