Malicious PDF — malware analysis report

Static analysis result for SHA-256 884da1325187b9b5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 14:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c203dd07edd3c4bc6765e6a0659309dd SHA-1: d4ac0edc402fd5624ee046047f36f1c88573e6b5 SHA-256: 884da1325187b9b59f85ef1686ac675c8a156318aefa4256e32c0d8744836517
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulasotupeladusu.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7009b4a6---98340870457.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/komizaxuwoseruz.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/97226191312.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/38819931912.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d5f28907---mubeladeje.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/601e1971870dc677f6db650adadacbbb/73770099535.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/93474360123.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f542d27c---64125296570.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/92385610498.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d6ed942d3---58234882536.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/htu3ukpapap5tsltpob8969ft3/88387380674.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/35809877528.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kadofi.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/44861485034.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/74bc9090981d2501425e874ce3e8d557/14830281914.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160701bd568c06---80156646907.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/59262433317.pdfIn PDF document text
    • https://bnovum.hu/downloads/14433002850.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/8724797104.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/68236300524.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/86858932502.pdfIn PDF document text
    • https://wineart.online/userfiles/file/namosogufuvipenok.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277ac3c930b---51929299790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=100+cases+in+clinical+pathology+pdf+free+downloadPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/64673487034.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_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 18248 bytes
SHA-256: 0fe4b14d6f199201b5c4fc31776f5ebfce06c1738365b3f6d7ee78ca15d17777
font_01_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 11176 bytes
SHA-256: 699c1dfafb113b9af506f730cb6d121d159f65df7f5c14b825a75af112c1ea1d
font_02_sfnt_off000137af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1