Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f2ee0f5c6ba575…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 21:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e32398495a0d9ebe0c04ca93f3c18d0f SHA-1: abb53946c5ec326f81803db681d98660e49fcf37 SHA-256: 52f2ee0f5c6ba575d3c5b58043c439686bbf27b257dce1fad001ef07579a4b6c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=sust+admission+question+2017-18+pdf PDF link annotation
    • http://artgraf24.pl/userfiles/file/83599902890.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/4hctgbco36k3ov49fr9ios2206/rudagijawotawomaxoz.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/57466783211.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/98928415988.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecadb15111---29859379500.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/mibakovanitorotojug.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/felukaxofu.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210719_003041.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612712e8be359---99776824394.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/zedugebimadexobalubidan.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/31a48a613e2f933a78edf88121559fcd/mavevafukamazozo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161073b11db05a---77774135690.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qead13s2qj5k93rgbucuifvuq0/ronufatogatopemet.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/donosizabusogiwabakelukaf.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/deziwusifetuxovifoz.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/42987457150.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/44156992182.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/bokajotanulemojajasesuru.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/18196245724.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/nafejagasuzo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d795b657---xasumog.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/84841855303.pdfIn PDF document text
    • http://artospace.com/pics/file/8727397529.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607001b1c7359---64969152916.pdfIn PDF document text
    • 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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 11420 bytes
SHA-256: 9093d9f53287be1f3b2d334dcd880550296a85c24a8314ffc7c7cf5c9dfe5731
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 18316 bytes
SHA-256: c5d26b8f42872fac534c33c09f7786ab94a0a6ccb3017438192fb4f819ce96fa
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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