Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed458c3bad55cc76…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 22:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 528ee2333233ffe8b34c554b85e577d4 SHA-1: 1f18cac81521be3023a34bbbad7cd3fef6392ecd SHA-256: ed458c3bad55cc7643f587561f91c87dca9c04aaa3b7a8fd4b0fc0965117d4ff
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strong attempt to host malicious content on seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tonyprins.nl/images/uploads/file/56480294210.pdf In PDF document text
    • http://eternalcycle.com/FCKFiles/file/40011402486.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/79972356986.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/luvedawin.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/74172061116.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kufefuvif.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/notuvipanikiseve.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wopejisesodoxotivixogetal.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/87103123640.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/retuterojunazeluwozijikip.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/baputufuvotukon.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/7263645934.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/miruwo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b306faf594---zikirozegedojogave.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/venepapapuwuzopewanijira.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p64utvct2j3jhrr0o1ivtsbnod/kevodovarawibufasewos.pdfIn PDF document text
    • http://inica.org/files/file///7245115415.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/degemetiretilusizagozap.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/vixikarudizebe.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/96636369327.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3840a3e2b8bc96cd331e8cc3cff1d9cc/73534957646.pdfIn PDF document text
    • http://ruihuitax.com/files/file/39945879946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spottedleaf%27s+heart+read+online+freePDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10704 bytes
SHA-256: 73e91457c6dd99fa671a2a2747bafef05cc3f1ac5f03ec442ee67ff2ee33f9ae
font_02_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 17396 bytes
SHA-256: c616243f5467950c0234fcce03c3e596d23890c87d3912d7819a8bc6723c9271

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