Malicious PDF — malware analysis report

Static analysis result for SHA-256 376b52a98fa60b57…

MALICIOUS

PDF

139.7 KB Created: 2021-07-08 04:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94ace10c870e9994bbc456924e60a69a SHA-1: f8eb1f3b8d6529715eece195e509cea61ebd45cb SHA-256: 376b52a98fa60b57b36197d3b5bf30a3630a8a28da17c8431c6581c651dba2f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cezartravel.hu/userfiles/file/sivon.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88c223cfc---11381340122.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a6b5ec22988e580899b9f00e5ccf6b84/wevuxutitameboxadizizezap.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d068a6e4d81befa7a090d678df0b1215/3251015439.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f8ebb09a22dec7c0b75fda35efc3955e/32241577283.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074723b6d92c---totujategiperulefusosupol.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b71d2dc273---finusizuwavotufizokef.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/39304014271.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/lunawedumikatirikameji.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/26065872982.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/bazovujugavi.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/xebuzelenazovisubob.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/4nvskd75ods9al6icnomsrv3k0/15777698942.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/54709056284.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/52841892235.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jakerowafirexulex.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d114b71d9---lukadunisubizowur.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/29375525163.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/43156217590.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160736f38c0f7f---97407068046.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b168635041b---564907494.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/61606412025.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8690305ce6eb203456e84f266e874db3/pujekobibomokis.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da052add13---79019893599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=first+class+images+photographyPDF 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_off0001b91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B91E 10808 bytes
SHA-256: 7609520daba4ba9f5dad8e3bc593f64a01f9681f38d58b103322731a8e574343
font_01_sfnt_off0001d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D20C 21036 bytes
SHA-256: b12521c7e051ad1be027f3d5a962768a0f4bcd910d3f0933c2ae068c01064f4a
font_02_sfnt_off000208fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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