Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec73f7ad956fd78…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 03:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a417fee7d4f0666c245fb7f2e43b57b SHA-1: cc94493e86ac96bd336e10c4f2fd84efe239c55e SHA-256: cec73f7ad956fd78deea90a218625985c02bd8c58f36c8bcb8eebf29f97918e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to compromised WordPress sites, suggest a link farm designed to obscure the ultimate destination and potentially distribute malware or phish for credentials. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415007302d5---16097096601.pdf In PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/xezala.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/32549811403.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/loduribokusuluwomevunub.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/88054708178.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/27561000015.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614919be542e4---43650178756.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/42240937904.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/bakimewiwoxep.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/kilutajomexikufufefude.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/waxatiduvezimirakosunija.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruvozudataxe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fa773fc3e9ea2374034aea43c0bc802c/36351014956.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pke7bf2cn6otndsl7ec6ra9nqj/suzazitosepujivi.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/luladeba.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/47526401121.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210919013530.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161489ed07b33d---54975876084.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76bd829a---84569203770.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/naweli.pdfIn PDF document text
    • https://ags-car.com/upload/files/sedimen.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb65406f79---dudojiru.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/palefiwoxoxunitot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=crossfire+game+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 10576 bytes
SHA-256: 9fd79f82608c0e6ef9d75b0daf6db0a04a84f9cd833f9b9f72e43c05f2d95907
font_02_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 18684 bytes
SHA-256: 78acb06b776de36a16143af1c069cb90dcddd3c6438a1b28eccf32b8e58ec00f