Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d3fa79916e7fc9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 11:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8e49956804a36ca4b6281f9573db81e SHA-1: a97b180ad49b2af89377f7a7757fad1ae3059570 SHA-256: c1d3fa79916e7fc93a58fa841d552addaa2734d6b71a2486790e9d7cb3093d81
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://segurodegranizo.ar/noticias/fckeditor/file/xozutinogulojepam.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa3111bf0---23123106355.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/43567531472.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/66645755006.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/befolokepivasadodaxu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7dd8ddf5a7b46a325e74419726a4e1a6/91688229327.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379158d1ef0---ridopuso.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cba80a37f7fe022919123205720fab04/91178990243.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/8467660572.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/50174501325.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/wevumoro.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/33684582102.pdfIn PDF document text
    • http://maidichike.com/upload/files/86836011036.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/nezadawunijakoto.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210903194656_132233824.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210903225259.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/61484069571.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/54282471562.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9eaa639e1---sagosixe.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/8083135033.pdfIn PDF document text
    • http://esejsc.com/upload/files/32779546227.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613700c5e6e13---loduwofizefizisifuravuso.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/5703361986.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/85912818957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mod+apk+premiumPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 10320 bytes
SHA-256: 50293def01561c695e9ed3fb2580da85e3993f707c025ace7b401e9f864faf64
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 16416 bytes
SHA-256: 5972d2b182db5fb741aad97061f325bb39dbe1155a38b2e43f9120ea9b50ff00
font_02_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 20468 bytes
SHA-256: e4dad2c7758e0256f746c0ca64236696d013c5fc26179c406e79fac2fa6e1ae2