Malicious PDF — malware analysis report

Static analysis result for SHA-256 795f88cd41b3e22b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5b7805daa1438eac7f6961afcf39df5 SHA-1: fda2dc86ea04b0d8ecbc04eb5fb08cc2c6438369 SHA-256: 795f88cd41b3e22ba0af3611955354a2eaa4334e84332fafff640028ca34e3a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to download further malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ga1j1poc48pqij7fna41fl7bc6/tapotegivu.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vfkv89heu086v478ugdp5vbsl4/43120871302.pdfIn PDF document text
    • http://rayanchem.com/d/files/2468240111.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/16188829727.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/rajuxaxezirulejobi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b9f089c83---65677190093.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/52749669168.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/19456448615.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1360a0227c4c53c083cc693f11f5dc23/nebodanojoluwulif.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/26d30be44ca18d7155e0d4402c036a96/54405719258.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wejopozero.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2893f556b735c33b5117b335f60520ba/75084391112.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/48556621996.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160add397874d1---nuzudemodafopexug.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c474c54571d---27316474638.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/10384441911.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0445ad892e33cc997f41683f607c5bd4/46573307475.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d784170f8---14183491993.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/28c2e04632e76cf67bc9947240ee1411/52235310587.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/f94e97bda8248220d3794a823bda46c3/22067803571.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608758811d3ae---52105947446.pdfIn PDF document text
    • http://midel.me/userfiles/file/29916089157.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/mujiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=trig+in+non+right+angled+trianglesPDF 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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 10488 bytes
SHA-256: 89dcd108fc008e484596ab142455f0beb1ce5577756c57ffff79e68ad967702c
font_02_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16128 bytes
SHA-256: 0c2033cae7fc7a659fd21d2b755cdabaaab58507c96eb4c0472bd6f7f1b331e8

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