Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c6ef2c2e24ec52…

MALICIOUS

PDF

91.7 KB Created: 2021-07-29 21:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf0cc214874078e52f97160a589a6dd8 SHA-1: 961804bc62bfcbb2efbb57b3f8b74d5234e1aab3 SHA-256: 30c6ef2c2e24ec52276e85e406cbe348d65528b14e407d66bdb34e4dae1fc36c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f459e852d4f---61486853554.pdf In PDF document text
    • https://viecmarketing24.com/upload/files/nopagefuj.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/41761290756.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f6a2bb6bf---nizutejijovilotovamegel.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/47373299210.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d935904e10---wutetizu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/sarofemegedikekan.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nadulon.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e80d8945ed4db47b92846b50065d82d8/gibesu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5245d1b4d---videtibotaxopibima.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/99959272786.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/00450f795bfdbd6524642c1407b70d8a/zanovit.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/u9o8rr7aieamgnlpkkovn0skhj/66815380791.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad04e6f5a---83311133880.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/zozesejonuderawunedinefo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/subip.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/sinevinev.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/62666027544.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/2981549554.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51651587d---34398968319.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/8812855435.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819a59a2194---21004505813.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/48967063496.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/pukekanumumutapeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=aiou+solved+assignment+autumn+2020+free+download+pdf+b.edPDF 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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 16332 bytes
SHA-256: 8d1cb20053457ad0d3914a8e33d081e3857e3f1013b673a39a92aa083610c681
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 11524 bytes
SHA-256: bb55642cef92d48b3205bd5f19e7437d759085e108f788a4c878b821e1172d25
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 16840 bytes
SHA-256: 7bc6b15297a3a661119a5a15a0e35655679bbf534a40aa7d15e616fbd2b0ad8a

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