Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af8e8ce712bb8d3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 17:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2443fbef097fb8718ca0534a59089bee SHA-1: 3cfc65c6afebcbfe97968eef4177f7e89b988c73 SHA-256: 8af8e8ce712bb8d38522a451dfa80ef575498af9567857e81ae63d86110fe932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. No scripts were extracted, but the presence of numerous external links on potentially compromised infrastructure strongly suggests a malicious document designed to lure users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160875f183b15e---lumezipogelisogisere.pdf In PDF document text
    • http://misr-consult.com/userfiles/file/97423599473.pdfIn PDF document text
    • http://ahchala.com/img/file/lipotufimopobudesivuxubot.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/63474772458.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735170a5591---61135997132.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/29875153256.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/potejomumafotipejakax.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38de983f2c---66343146608.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jikudiveruxagaluxor.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mh9e2oa7ll1r14ahv6pk7p3630/71063817889.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/85247526314.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/15202530806105c85a3348f.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20983950130.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xenipalifazatego.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/12319035736.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mitt9cspointtbn3mdla7gbam3/75044105898.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/fudidipor.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kcdqhu6ibmobscea9pb0hmctb0/93473123014.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/29777792309.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/85925149199.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/xebekusuwibopufiwim.pdfIn PDF document text
    • https://computerzone.pk/file/11632182600.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/haja3oqvj3d2plkd18p5cmi3d5/69105617571.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/904605d6456389d5e579f917867a553c/82722512446.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1151bdff1---42443518157.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/83387929831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=transformations+math+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_off0000ccae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 17332 bytes
SHA-256: 8e5b7eb759539ae90c19377eed0fb0e695af6f790309e2ac1835f8084afbd9bc
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 10548 bytes
SHA-256: d7178ce06f881369466ec0284eb1dda2a172eed421a5a9ed4580e351416dad2e