Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0973d3cd856c280…

MALICIOUS

PDF

134.6 KB Created: 2021-09-18 14:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d90e6310c8d334ab93f30d1913a063e3 SHA-1: a4aea00be87cc982b255ef2af213ab9f3102144c SHA-256: b0973d3cd856c28072c7b32611bcaf6b0eac7fc70f946c36206a877711599211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=random+access+memory+and+read+only+memory PDF link annotation
    • http://studiofranzoni.eu/userfiles/files/sibomolidoxexodafitufokos.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kd3q9dcg26td4ap7pr6mp4d72a/guzomonaxekubade.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/sufib.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/81079535640.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vilixazutofibimujobopasas.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nurokovupobedekusisam.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/99833554565.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161443d356f10f---reropavigup.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/wevavidobopikutusuwezevof.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/756189d9dbe0142989843ccabe9fcfbd/89453600097.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jotogex.pdfIn PDF document text
    • https://doitoutdoorz.com/file/WaseQlbZaR7KMxY4.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903115126.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613654b5b3a7b---58683441483.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/nikafafuponow.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/dobegiverapukapavip.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nvchpsik979b71g7fc18mop18m/xalakiwolonokisixaguxe.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/85795640769.pdfIn PDF document text
    • http://koutingchina.com/upload/files/17539409266.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/75888398317.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f222334e89381fef426af67841e72820/bagubodarejar.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_off00019ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF2 23148 bytes
SHA-256: 0eb7c5c26eab2201f8895efbe34de235029ac5e98af2053fc09d58776a543742
font_01_sfnt_off0001dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F45D 10500 bytes
SHA-256: 058fbe7bfbefcfb9da28d5f1b747604fd55495506e448907efb28b70bd93a5c9