Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1288b112555075…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 08:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2da011e32105d00b4ca0ee6e8e843f6 SHA-1: 62f8e6b000162109777a61e0143eb639931a80f7 SHA-256: 4a1288b1125550759a5fd37d00f8bee7132f3ffd24b380555ca183e6c6f8f1fa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be instructing users to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=starfall+ela+worksheets PDF link annotation
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/buxufegexorotez.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nidugapodezadezabarud.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27d3dcf8e9---52200576845.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/salewuzowedodipusuzojuti.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/34492053074.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1687208e45---lagewodow.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37b6e9fe4---masekijive.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/92c7f2b4d3efe575d780d9fa6fe0466f/ferinerefaxegilifam.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/fapimevipojakobapuveniwuz.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/foxozusomil.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/nujumoriz.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/94032831525.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tridcttcoa5hn4u2krlo8hlu07/kifusakeruzogunapa.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/67346439197.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/78db8bd95e85054ea6ce5e6f193c434e/48780720299.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ccfbe61b9742c05fc6ed201d5b452a36/xitigatawasazifemaxegej.pdfIn PDF document text
    • http://kotolantopeni.cz/file/86417327965.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/7661375664.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/74518318486.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4b913012b---35827470151.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/tegewikejepomadujakifosi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/utr6m66vd9p3gju9apshmvne30/75251089508.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 10368 bytes
SHA-256: 1e96accd18c9d44af9abd8d2b0b89bac1b956c2794eda08e6a96cae386ca8bf1
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 17496 bytes
SHA-256: d0f6021b2a642ff096c268fdfa9673feec909bc4f922af51d9da88fde50f89f6
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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