Malicious PDF — malware analysis report

Static analysis result for SHA-256 518cd76c40790a03…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 11:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f00baed254a37828bf5b1e54442d9d8 SHA-1: ebdff37b1e046e6493b5ddc12c94971ab1b9aab2 SHA-256: 518cd76c40790a0302db05d2e3a485613bfd64ac6aea408da18f1354cf311a21
156 Risk Score

Malware Insights

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

This PDF file contains a link farm, as indicated by multiple heuristics related to PDF link farms and compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links. The presence of numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites, strongly suggests a phishing or redirection scheme.

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/it01q3rdv5m20gb6qnumsslsc6/rumofawolazo.pdf In PDF document text
    • https://dacinsara.ro/fckfiles/file/19705008000.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/fobawagapevekoto.pdfIn PDF document text
    • https://binhvi.com/upload/files/30130128775.pdfIn PDF document text
    • https://inks.bg/userfiles/file/19534415843.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/1047311734.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d667ef27d61---57018017871.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/libarej.pdfIn PDF document text
    • http://myphamasia.net/upload/files/buzim.pdfIn PDF document text
    • https://highrise.pl/file/dugazizuzoj.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052304442768.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/dinaposemibuv.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/7888336142.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/loneboleriranusejosirusux.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/25963875661.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b75c9ef2---69073866450.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/nonube.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lisave.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/70376802175.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c63aa18adb5---39186153990.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c124d585fb---3765146629.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/tuzubatezopej.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/zajifoxaroduw.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/29616472385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=el+caudillismo+militar+en+el+peru+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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 17828 bytes
SHA-256: 8b690d0ed8d124b1ce2a842d1f17c7380cf89a4b9297c4c17f65d0a96f2f90c9
font_01_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10864 bytes
SHA-256: 000ffc571b1c4da41be4625f2e68684e27df720e100c1f6fa083889fd1d4dc11

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