Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fe1802a24c79c7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-08 06:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b52f6eb6c3179c833891882cb3d15217 SHA-1: f52ea4423b373e44dd24c512a46a0b447480f8e0 SHA-256: 52fe1802a24c79c7eb9ae759357aa535d49ce672f9f8fdeedd23363655ad80f5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phish for credentials. The presence of multiple external URIs and the compromised CMS upload link heuristic strongly suggest this is a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=anelidos+poliquetos+pdf PDF link annotation
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3c9a57b99b27fdcaa49118ee619eec91/musor.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/62756013984.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/49862020739.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5f770b280---sororo.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/gexelukune.pdfIn PDF document text
    • http://www.moyekolodin.com/files/25534471090.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bofuwuvifanotawevaf.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/k5ppgl1e6cik413p85umj535q8/davuluzuxusevosur.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/zakune.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/37258301161.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/lefovefetimesenelen.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/12a6d020e0c3614d1bb903fa991e9732/logiponi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/67102176586.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/dirodefuba.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/rapexifolaleg.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/86f9510d0e8e1ae9ceb3fe0bf2b7bae9/zubikonipa.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/73537751574.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc3fbe46a6ee9f93cf2b5ac1d39ba2b9/patetagutisoborujikalav.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mg8bfs7uqkmtd9fcou1m91u5m6/gavizofutupobexe.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/56960dd323252839ee7fed30e2cd4908/zukixekevatuwiwov.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/57202540934.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/zexalubomojizo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/bifotusativa.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/pituvezexezevuroxam.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_off0000b642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 10456 bytes
SHA-256: 7ba66ecdb000aea235719371cd7433f71a9ba91b664ae247ed1c2c3a647033d6
font_02_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 15048 bytes
SHA-256: aea34ae2fb5c26d019afc60da3dc8c21040a39cee06031ed00240ac1c8e8b7fd

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