Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c4f656d5d796d2…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d7798928582225ebf8fcaafe3d19f71f SHA-1: 4f85a6c07506c92b4ff39d23fc2a682c8e43e981 SHA-256: 75c4f656d5d796d20f3fa9c1cdfa65da8193b647e62e65a8b244f9087a9814af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains, which is a common tactic for phishing or distributing further malware. The presence of invoice-related language further suggests a lure for financial scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fulzugaskozpont.hu/files/bijolaxutukefuv.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b4c499630dd58fcecc6c01e01c08bd78/4607144918.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jelerixavovi.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210616_7E7E6FBB8B4A0C79.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/73920296486.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/cd823c76a759daa95651ef5d2b61312b/93034661785.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bixikenumanubago.pdfIn PDF document text
    • https://cape-electronics.com/media/file/52395765857.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ce8cd122a22f1958d017751ee9068a27/towamowoliwizabavivitis.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c88d9f4dd---natadudozatozuxexez.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/74469a4b65aa14941e821f7b163dbde4/dakalesojemulokinejoguwuj.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e36227739c---xeperakakomamob.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210702215225_o834nh.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kv724dttmipgk0v7lpelgo85aj/fijevuvobivefo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f2f08213a6b66f06f47d0b907f31aa75/38233966571.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad849a9bf---suterodupuv.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/dupilafevawekilavu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/46336544860a2e4796f07e.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7s1759q4slsl8tm940jm6j0n94/64487480689.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e157d072a---jigufojogafew.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/xefiwo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nf5u3nubrfv0nmgaq8uaknv1es/buzixa.pdfIn PDF document text
    • https://ridersshop.it/file/44251241621.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/51162159534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+fill+out+an+envelopePDF 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_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 10324 bytes
SHA-256: 2a60f607ddbb0cd6f096711cfaf6992ecf59a0d40f14ae88aea10f4db298c99a
font_02_sfnt_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 16452 bytes
SHA-256: e549c22c9cfbb43432e34446818fbde99c2c289dd0e7cfd7ed50bdd1acc37c8b

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