Malicious PDF — malware analysis report

Static analysis result for SHA-256 76418d2c37f57b6a…

MALICIOUS

PDF

75.9 KB Created: 2021-07-22 16:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b2d37da8ea18595ca361220a4895725e SHA-1: cea1a6398864419b64d537bd13a894d3334645da SHA-256: 76418d2c37f57b6a4dba0095bf715fb500db61bbed8f5a3030c9268ac0a721c1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to lure users to potentially malicious content. The PDF itself contains no readable content, further supporting its role as a delivery mechanism rather than a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7d6f0b8b---gagasiwipenowufomi.pdf In PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/61347770660.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/81713241793.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zanakaw.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad9d53603c486f0b06b928a03ea9f7de/25717387768.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/genazalokigofamepatixa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160737bc221b11---49311116289.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a78f962e6cd0494a15701eba08ec0a91/watomuxi.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lidibikedelovilaruvufoxux.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e7362cc6---12506018446.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d1vcn11dgg9l8ifeoe7ut8jsi3/74100239483.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160792a4e59dbc---rosigifomus.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/31488680599.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829be0e11b7---refigetexotulodelu.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/60071805849.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d576893ceb080d009667a3cfcf7b273c/26426754068.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9m0v5rt33dmlmsoc4eed08667q/44931146873.pdfIn PDF document text
    • http://novichiha.ru/pic/file/81492023495.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9033bbf7---90898287778.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/aaa82f3701246f65f1a954f96f508e52/54439634484.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71082e533---bojulagoremefuf.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5ab4cf8decf2bc0b7cb49121ac01969e/magepunemodokixarabuju.pdfIn PDF document text
    • https://eventaipei.com/upload/files/xavovukalodamiziku.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/19538174465.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/31310402057.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pokqpfoabr6745617581mr05ck/52936298998.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65329793462.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/42349021079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=income+and+cross+elasticity+of+demandPDF 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_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 10700 bytes
SHA-256: 5ffbc434e025aa4a5500f7342ed160ff5026bc6542d7e9e9eec2e4d3ec38eb05
font_02_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 15960 bytes
SHA-256: c4bf4e81d7cea689a01365161e79081422dcd74c9c48a914c082f72410b4ff10