Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae6fde913ace993…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 13:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c3084abc0a9b258de42917f6973ecc1 SHA-1: 10ecdc7f54bc287f9d4497566405e9a17243c30b SHA-256: fae6fde913ace9930b2c4641a9e54c60f17a3f4c367a854cac9a81f16a1cc037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=animal+adaptations+activities+4th+grade
    • http://alhouti.com/userfiles/file/semitem.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tagikizarebitig.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d44edcf75a---laforeb.pdf
    • http://arqing.es/ckfinder/userfiles/files/1653671674.pdf
    • http://siciny.pl/userfiles/file/zoxipabobetufafeletodel.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1bdf2cc80199a43cc12aadf55154072/pabotogazexibowamiliz.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/de5fpqd429trp7b778mlolg0h0/xiroti.pdf
    • http://fandimnarodaku.cz/upload/file/vopunivet.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ce4fde088485d4c257e3eb2d65d44b2/madulafuzegejaxa.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/kupigezazuloju.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/64011b5efe3dac8610db763e16ee5da6/75284928383.pdf
    • https://aedwea.com/upload/foto/xuwuvizojukam.pdf
    • http://xn----dtbfdwc0aaaev8k.xn--p1ai/ckfinder/userfiles/files/16912962501.pdf
    • http://usaoxin.com/userfiles/2021-8/file/bedorilam.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cea397abc8fb5fdb81c2d77d3bf929b2/60453904115.pdf
    • https://ncsccalgary.com/userfiles/files/6982048902.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/bc4fbee2b6301e6b3823cbc73bf107e2/67996662732.pdf
    • http://harchovyk.com/userfiles/file/mozaripumemezafepifuwa.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mijatuletoluros.pdf
    • http://alexhofford.com/temp/files/file/vedibot.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ff66b397db33701e94007b2782d48935/bowasixig.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e041ef55679---38884360801.pdf
    • http://karpatskiles.ru/store/files/tobumilibenurowukowuwe.pdf
    • http://aaronandanthony.com/userfiles/files/kowesanirimugomurugi.pdf
    • http://www.vegagastro.pl/upload/file/pajasuwejagatozotogez.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_off0000df90.bin
a63943a20afeccc124edd08e34055b584438a3034e600fa54dbe7a4103c17bca
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 17256 bytes
font_01_sfnt_off00010c2a.bin
c2c8ee987dc2bc52b0fd913fb03dcdf5bb9a8407f0af2eb55a98ff3053cd8efc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 11088 bytes
font_02_sfnt_off000125aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 16792 bytes