Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d75991d437318d7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 17:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1cc54ec75a124233a0b6f9831f3cd4e SHA-1: 3533ad02fbc73be2956138b515231d807bd33eb7 SHA-256: 1d75991d437318d75de1b7aedf1e422f79f43bd8761e74cea66803415cc56eb4
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content or phishing pages. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=photo+blend+app+android PDF link annotation
    • https://aspaeng.com/files/image/files/loxapezuzorodefe.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/51402682688.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/92847865918.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/93754800230.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/41258476910.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3148595472.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/rugigunurekufefunom.pdfIn PDF document text
    • http://gdgom.com/upload/file/210911173517819473ko1g2o0u1o43.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/75300081780.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b79f880e34f8eb5f274d3ba58f5d7428/livadubutijuf.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/40553130891.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/84520273546.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/k8e2b99oi1s5a88cjaldg9hfdi/zababowofukobugamus.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/9614415324.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8abb3b8f---54257072961.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/19495207662.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/66680778260.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/tesiresetudovosipowirup.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/92018132599.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/jadoxinopezogovi.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/93930463666.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021d11e2cb---97706735989.pdfIn PDF document text
    • http://rafaelokazakov.com/file/jugalejegimuzuvufoxiv.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/liputuwig.pdfIn PDF document text
    • 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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10460 bytes
SHA-256: c505afc9a86aed23d00e43e6a2c280b7f69cfdbeac8c2d16389b829cd794612a
font_02_sfnt_off00010ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 17484 bytes
SHA-256: 9ae771c2df421a0d96164750bbfdbcdcadee4611a96c2f269c6e831c3ae6c22f

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