Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa928b77bbd86e98…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 02:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b6ad5a4c6d93eaa9b1e869fab8e1386 SHA-1: 1f8284b9038c0f0a2b05aa8deaf8d793ccd1ed2c SHA-256: fa928b77bbd86e9829855637dab95c5c01b4f3b41a79d4c6ffcd944fae2df893
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://nuraski.pl/wsg/userfiles/48005606679.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d3e8a8d6---vunajanusevikofigope.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zosowamoz.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kizavufisevoketilim.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5226ea803e61061776dc75d1c0bb6679/lulopovoj.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/sezapaxiwadikerubimejo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://falerisztika.hu/tmp/fexekazexofudonuvolox.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/9283636027.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/lapirumejiwonuzuxebufobaj.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/50249383266.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/01773f5a85836445585d1e0b58ddadfa/40583092139.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f55291869ec---gokasurumuwovefepifonat.pdfIn PDF document text
    • https://polandpools.com/contents//files/zivanezifonemikiwijo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/zodekolide.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/jedogagagovurirazatubuja.pdfIn PDF document text
    • http://sivam.pl/files/file/54399283933.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/220fbccaac68fff3325ec7fbcb8a7352/butiwisorome.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/96829419721.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/96139840267.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bdpkdpq0esh97iqohs119oqhno/zalonogusa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/22e1183c313903f8ef903e76633993cc/zevigotax.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/58857485812.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/50f206ca5bd1e32ec2152e3f6a6d95f1/vugewonisam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=orden+alismatales+pdfPDF 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_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 10564 bytes
SHA-256: 3f1c296c0bf7254d37df9190e727c257161f86180b599398b17dcb9618482789
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 18144 bytes
SHA-256: 038da5d3654e9c9d7498be678822b244f5a79724a6219211333cc648199aa34f
font_02_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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