Malicious PDF — malware analysis report

Static analysis result for SHA-256 19320ebe82b87110…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 20:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2b6792c5ca74392676d44cfe86a538f SHA-1: db0099a45a58503c09f2223b515f9043fedb35cb SHA-256: 19320ebe82b8711087b2715b109b4bf91a31c3e0e5a0e34aabe4d48768281908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/47a18457695bf86989ba2dadb3037fcf/gasedewivezipede.pdf In PDF document text
    • https://navoloki.mebel18.com/uploads/files/94213941093.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/xorixonixezubiwedupixefef.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1b8d81898658f03442e39081b310f62a/bozuwojetipoxutebizori.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/juzija.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vuxogawozodafozi.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/23761671162.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/kuzeriluwakuduz.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/68861166688.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/43821c39df76a2ce991ddedbb3c70339/jikuvupaseda.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/betanetotoda.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/kadusewetoziz.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/18552802808.pdfIn PDF document text
    • https://tpk-m.ru/files/file/38857024281.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xanipe.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/15887503505.pdfIn PDF document text
    • http://epplast.com/files/file/wotasigofadonetodab.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/38191224887.pdfIn PDF document text
    • http://dhf-china.com/d/files/tuvewirik.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/wozokiruzoge.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/tipuz.pdfIn PDF document text
    • http://mebco.ru/images/file/xugefimizupuxa.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/marodede.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109090120184942.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210904115502.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/34451450705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=preposition+of+direction+worksheetPDF 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_off0000c459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC459 10688 bytes
SHA-256: fe0026f632db3a23bd339ee9382de4bfc2c70f47651382204885ffa8c6732b2e
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 17860 bytes
SHA-256: 9682743808ced44be6441f4d8728f9c673e9ec3690b72142d44f8bc3fb9fbb2f

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