Malicious PDF — malware analysis report

Static analysis result for SHA-256 8099b1c0a88a56ec…

MALICIOUS

PDF

83.3 KB Created: 2021-08-23 12:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 18c3bb56a0cf970d7a0b5d2879c329f3 SHA-1: 0b18f8b870d505d347277a60eb4cc577b6a11ea2 SHA-256: 8099b1c0a88a56ec22c009df81c5046b5b53c2a4cd92102379ac03e4e276a60f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=inscribed+quadrilaterals+worksheet+answer+key PDF link annotation
    • https://prawobrzeze.info/userfiles/file/woxoxiz.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/jorasitalakakofekus.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/88412252710.pdfIn PDF document text
    • https://unosms.us/userfiles/file/potomawozuwerebevawel.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6324dc719---tiweju.pdfIn PDF document text
    • https://jin-ji.com/upload/files/83563940461.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/82811610430.pdfIn PDF document text
    • http://guowangcable.com/d/files/xakusevovogilanowevimilu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c043fb51fac---69584042145.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb749c28d---7068599122.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/84281792064.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac337186d---xivuzule.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/56370875596.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vegemufepebe.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/91861228412.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3dbe1b034cd9e355acf6d1c995615b58/28936411439.pdfIn PDF document text
    • http://amandamaitland.com/images/file/tewor.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4de37ec149fe8121f14416ce193afba6/penaxifijevulaxozosubapur.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/33050464227.pdfIn PDF document text
    • http://schokobrunnen.com/idata/81015186092.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/81229914105.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/tukobosotadofebepuvobijot.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4bcd9d1b2---66238798968.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/wapukedanupetu.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_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 17152 bytes
SHA-256: 42720d433ce2a2ab058fa05c8ee90bbf789d15b52654c640ccb75fcef35e7017
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 11096 bytes
SHA-256: e011178a30fd56948263d6b0c22b84dbb63dc5d809f16381494620d440dc5879
font_02_sfnt_off0001260f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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