Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cca47f70946035…

MALICIOUS

PDF

89.6 KB Created: 2021-07-29 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75a0cb271fcd7278b37d1d812c0e80b4 SHA-1: 4af05ee9d539b62b7a32575afddb62765bf0aacc SHA-256: d2cca47f709460350a51f88d17a97111abc45e453389ecdfa3d8f02bfd171e31
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through a seemingly innocuous document to a network of potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://angel-juicer.com/FileData/ckfinder/files/20210613_1850FFA3EAE8FC4D.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/58452797825.pdfIn PDF document text
    • http://davcpundri.com/css/file/tevazi.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/miguperuwinud.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwenenedabonegonuvavaned.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/52046163693.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/87ac98d8022420dc9fb058fe87b8bbff/buwabode.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/jolupifusetomikugepud.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/aa4a0562e95bfcc0f736229360f2457e/96448173954.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a198914e0c4---jeropegapileluxifeviko.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1107f6adba---48664413704.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/mebavipab.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/boberefozobanurexazipax.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/depuwunumuxepas.pdfIn PDF document text
    • http://www.buildonhope.org/file/nerixemoporiwibije.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608887672df8c---tipurarinod.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/44576658228.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tovidewexituwakegidewit.pdfIn PDF document text
    • https://subarini.ro/mm/file/penibufiwal.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608017a18317e---wazurijunig.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e138962b24---kefakeb.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/74894878924.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210709_4974ABABF12F9105.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a442c1e0aee7d84e1b23e6088feae0e9/kaniborap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vype+epen+3+instruccionesPDF 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_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 17280 bytes
SHA-256: d3e2c6689b780938b0109d0467680b4d3bcddd7a6ee28f10c1091384bc54bf63
font_01_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 10512 bytes
SHA-256: 2fcf536f99484e0bf1f6a7efe006cc2a650ac9a13fd13fad818c9a80ee37d63f
font_02_sfnt_off00014074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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