Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b9006b0a6ef3a…

MALICIOUS

PDF

71.2 KB Created: 2021-07-25 07:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1287565e535866d8920305c8a6228975 SHA-1: 9f61c6f2f19fffb28530a53b576bcb8807abfc1e SHA-256: a05b9006b0a6ef3ae831e4eff59c8e5fc49739da988c64a12e6718c989831c18
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f2c4be65d9e1948aba18c8ba8173342c/fedadovisisijekivigiguzef.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/20163305505.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/kudagugetizunewawiseru.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/320ed5a7047d2c629eb584c5f512e0b7/zabokebomotezowukudulosir.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/41573097980.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/hee9nb9u083q334cjdqcbnundr/11365859391.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/61416425466.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/sedip.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/30750591496.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118f19d44f---lorazo.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/45364436528.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/87a67b6d8ada0bde0698c0ed19fceb9e/24519076099.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/ridavubaguru.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/siparozozixa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6540141efd---sevulepubirebe.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/xufujisotatuwizok.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13115672b9---xenibivarubovino.pdfIn PDF document text
    • http://szwygs.com/upload/rupinedetulavilonebusow.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/81677701402.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ouubg270sukfo97ur5uu5lgrg6/91288930004.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/92434396351.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/90648089965.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/mipekot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=poor+richard%27s+almanack+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_off0000b6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BF 14728 bytes
SHA-256: fefde95d9c1c8625c55eb5a361d35268d3ad2b406ff06943f8df8c472ba1dd27
font_01_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 10784 bytes
SHA-256: 1792ba054ba50d56c2593185b656a365d34e7320b5ddca44aa9431ac27b9b511
font_02_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1