Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ee71a578c66b0e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 08:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f8370d1f015a6cdc107595d88fd4055 SHA-1: 00423f94ef1ca0b6a5a0d89112895c5454c003c4 SHA-256: 82ee71a578c66b0e1d33004525a7133b55f2b4d636fc14435257ae337a029bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pixomot.ru/uplcv?utm_term=windows+live+wallpaper+4k
    • http://aristosaigonhotel.vn/uploads/files/91604343949.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d9431408---76359943082.pdf
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/11705268577.pdf
    • http://haiphongcontest.com/images/files/ropimolobujigigedigupo.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/25251834522.pdf
    • http://drivingschool-brno.eu/files/75404322302.pdf
    • http://golfvillageonline.com/userfiles/file/genonufoniximuzujezizu.pdf
    • http://ovstav.cz/app/webroot/files/files/40518313467.pdf
    • http://songchanraccomposite.com/upload/files/selinotarovaragevako.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a33acc4ff---palafidezizunaneronutujo.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/wivulopazagawopu.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lumujesidojuguvebuvejet.pdf
    • http://tylincms.com/userfiles/files/kasodezupizofazifijemipi.pdf
    • http://redskap.ru/userfiles/file/davejudi.pdf
    • http://smenergy.kr/uploaded/file/155197756613bef35b7465.pdf
    • http://insuralead.com/userfiles/file/78089211268.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de52b853a4---lawaditapo.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613127885d5d7---newinawokuwirojo.pdf
    • http://chiengthai.com/file_media/file_image/file/40132503866.pdf
    • http://weshare.vn/attachment/files/pipowu.pdf
    • http://gediklimakinahidrolik.com/resimler/files/zisen.pdf
    • http://adirondackseafood.com/ckfinder/userfiles/files/velaselobuxuziz.pdf
    • https://crc.creativechange.net/ckfinder/userfiles/files/xinatarabagube.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/migijirokubixemoru.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130822709740---fotewanirudem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 16792 bytes
font_01_sfnt_off0000c901.bin
29073daa8468cffc65e0306ef2e6ac70586a5621d23af14a0f4a835964fa5d6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 16248 bytes
font_02_sfnt_off0000f260.bin
515d0b26217fb48268ec971a354605a981ae66f5e630676a864ed56fd4ff74f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10600 bytes