Malicious PDF — malware analysis report

Static analysis result for SHA-256 17450fbaf86a9864…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 18:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22c2373ba99c6336da43d5e58932f003 SHA-1: 60f96b6e6befff70aa35c24ef131c37a42a344e5 SHA-256: 17450fbaf86a98641694e9504d11c90a9933a37bf0cf798ea7bb45cbc7af8b1c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://chcial.ru/uplcv?utm_term=photosynthesis+diagram+worksheet PDF link annotation
    • http://tasteofruraleurope.eu/upload/File/63229855422.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/xuduzazilapikawerotuweri.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ccafef22b---nevugajubinodewefi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/7950781382.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/57110728812.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210522051240169.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160984c75a54a1---gewimewagup.pdfIn PDF document text
    • http://lse.hu/userfiles/file/kurorizaga.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab02f57103---xepegipululiganarowezu.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/62325588023.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/tevesurafipelisenitivobis.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01c59aa0d6---dibufipuxa.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/vurofukokemagobawuzabuwu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acb46e99b23---kuvovedisesebinukeduw.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59601772624.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/webitilenova.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/73490923981.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zirifevuzidi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7bea0d7c9ef650e6759bdbb5046a5ddd/72173356746.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078e43963536---dibizuzepa.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/57499884885.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/surujuse.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16114e797a6314---gakogigakubezo.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/vorixan.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/bapili.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/34971722359.pdfIn PDF document text
    • https://doganagolosa.it/file/60653220062.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/31700395911.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 10944 bytes
SHA-256: 100c0a87ae9ce2f3402500920c10f99ba1282470b8f2c1e9c339e2d8f1a761f9
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 16312 bytes
SHA-256: b409ef757e08c7b696ad756d178e151237fc875dbdff3a478126a135ae434d16
font_02_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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