Malicious PDF — malware analysis report

Static analysis result for SHA-256 434c1ccb1131e602…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 12:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00e6f6c8df037b798ceb16a6c1b11157 SHA-1: 946e83b6d342b5f4a8dd0b4c05d3b66840cf3fa1 SHA-256: 434c1ccb1131e6024edade832cf5e4f23c68e68444641c95916f29be5f22697d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links, many pointing to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs further supports this, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f1a3e7542---16061533032.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rhbu3spi8058f6h5ephuh7qrui/17053576624.pdf
    • http://www.deopendeur.org/imgUser/file/jevamap.pdf
    • https://betentour.com/sites/default/files/file/naxizazufivewumunudidebe.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a98a45703aecd3d3e5817930df026827/rifar.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67cf81244---34891331825.pdf
    • http://botosani.ro/img/uploads/file/67054532238.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bee73124926---27874468504.pdf
    • http://temple.mo/userfiles/file/69139223956.pdf
    • http://bafiti.com/sklep/userfiles/file/xolanuwijuluxoponofigifin.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/vavg2babv65aq0ve1a70gempsc/gifegir.pdf
    • http://taxicityplus.ru/userfiles/file/28776463201.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jh4nci4mf0us57sfmhkeko2knq/20639822079.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d53ab17d---53186962705.pdf
    • https://susta.vn/userfiles/file/dodoronebogowu.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/4946708703.pdf
    • http://nature-revive.org/files/file/tudavebitikovoraxik.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c91720d42fe---98984008431.pdf
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/36092683322.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3e889ca1---56144956573.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a918fd06739---xesena.pdf
    • http://msamerica.net/clients/873634/File/12105017898.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0dc1fbf2---gananasotiwomikelipuj.pdf
    • http://archpiudue.com/userfiles/files/69157860050.pdf
    • http://pechati-piter.ru/userfiles/file/79155730357.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/69af40f4218bec4c6666603e081045fa/voribabopomidavof.pdf
    • https://promobryansk.ru/userfiles/files/32441607820.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d8e2d2ac---77645651780.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=conditionals+all+types+exercises+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_off000100d9.bin
1651f09a420b6476a67a3969b51c378b6b0e018f4bd018c3b03bc4eb7a743c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 10860 bytes
font_01_sfnt_off00011a24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 16792 bytes
font_02_sfnt_off00013236.bin
80720ee124c2dec8c2cd29b3524fde42e1a85d4147615cfc0fef13cd9fa7f971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16832 bytes

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