Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dc912ccf8e5879…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 00:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90a176bcfb726fe9f615928fe5cc8809 SHA-1: d749ebc1fc98279907b8433432b88c63f7be9187 SHA-256: 49dc912ccf8e5879cb658effc1bc144bfd6d3dfccae5b44eecb2c32e359d9245
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish or redirect users to malicious content. The presence of embedded URLs and the link farm structure suggest an attempt to distribute malicious payloads or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/njjstic7aa9057nt6anl5lmbu6/15498686245.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7364e53f---90016344973.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863aa067034---kozizuvosi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pl5d3asj00f1c209tphcvi8imp/71783858373.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d267bf29---mizevejigevukexonib.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/tutiponarolugoguko.pdfIn PDF document text
    • http://zuche0551.com/upload/file/naranomevedotoxunapal.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082770e53467---pubanefiliranidupubalok.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b2b3ae6ffd2578fe537febf4f393af46/95843993413.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/92419944381.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/96026747065.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ruzipix.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xokenev.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7uqbk47f1tr3j47aac6hfnd404/vuwoxolonuvuxinusidigom.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/xunegudetirawere.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jikubukuwemewule.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d385e77b7a---91707818086.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f80abdb725a---towivasepovaworokediru.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2867f1d588---posikidomewanofosi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ef48289dd697065eeca8a24b2064e682/4558847139.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/cbba9b5aa3afaed1f852a17b944e192d/90635804029.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/fofebemazapuxitiboli.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f12ba0d62a---nulelurejesapifopog.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/91231894474.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2d66r3ctceuu4hfgs5d3po2hk5/legezofanebosewugixudakuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=song+from+a+secret+garden+sheet+music+pdfPDF 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_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 18076 bytes
SHA-256: 10fdf58ec47130585d8cdbd839302f2668c203408ae7d396df0503ddab498337
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 11196 bytes
SHA-256: 684f9c0b9a4def4d6d410b6614af24ac24d5d576f4d3a53f4ec13ee2d38d0026
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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