Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb51ab66edbcb8e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 04:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03833cceab91da5f0478ec4eb12dbb27 SHA-1: e14653d8dd6cd44a9e74ee0afb4708dda58dbf77 SHA-256: efb51ab66edbcb8ee52e7f574edae76f7f03ad3b0f4f26ac2df4922aa5a02a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs hosted on potentially disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0a352152c---8962427579.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///73657534500.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/48082777607.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160729ece053af---62002870406.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/sijakegemebonisogiloturi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/67411940968.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/xokanamezefedapetikax.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/3566634581.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/zinezodesidemanewoxu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/17493190010.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931f32c1c4c---manapogesufenikeg.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/9524631242.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd535888db---48274856848.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/10610922362.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908797d532---bagatidudutubinedagike.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/51e8ae0cb5c4fb96cc7dbaba4276ffe1/jupigezimizod.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210520004732.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1138ef97a9736892ec097138e645dcc0/wanibovevajakuxorifota.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/11148021225.pdfIn PDF document text
    • http://planetamama.ru/files/file/97394099056.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/jujugeloboz.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/nufob.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/xonomazigegiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sanitasi+industri+adalah+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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10516 bytes
SHA-256: 20e92f3860d546f43a24017742e47ce456c20c60ebe3973b087fb0c247c966e8
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16696 bytes
SHA-256: 47d45c6f816230bbe1c8376fc043ae9dad3a756141da20629236df465d48ce2d