Malicious PDF — malware analysis report

Static analysis result for SHA-256 52823064cd87a534…

MALICIOUS

PDF

89.8 KB Created: 2021-07-04 03:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 80367df041ab7171aba7a6db352d2d79 SHA-1: b11948795312b3809052a67b6782deb361d2d471 SHA-256: 52823064cd87a5342f697cb58285d9646143a83d2e2cb2cd0d186f7e751c49f6
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://crewmak.ru/uplcv?utm_term=x+ray+for+pe+minecraft PDF link annotation
    • http://dichvuhieuchuan.com/upload/files/wujofapito.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/pebekifekomuvujuwem.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3aa658d7---jijozolimejujamorowajaxu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5632117855---14606869698.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/73620693075.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c80027b32e6a9beee751a9cd73e7265d/xogigasivebojapena.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fitudowulalamabozaxi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/3l8uppgu4748va8q5buc6kmgkc/bebetiziwasumixurabiduper.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/nanibofulivedirurak.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/kuritekaguvon.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a520d56e---446816392.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dodinafi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/zijepebakaverili.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/31456049371.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607615d2e7a7a---71920422870.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec7c1464cc---duxovukewazumegamemexefe.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22416d8c1---32206091894.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/68945538396.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b25956553ac---33408265472.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/buzuzegekukurowow.pdfIn PDF document text
    • http://cartopack.com/Images/file/wopowumimilex.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/887f72f8224f3dfacfc238b8b5023df5/wojep.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e0f7c700---7791350518.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/3128219295.pdfIn PDF document text
    • https://ksuskalology.com/images/file/39630230748.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ea3aa2955ef6083b1918362ad8760fc8/kowinenegilan.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/12668838153.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f721f60349---8762743213.pdfIn PDF document text
    • https://medlineplus.gov/xrays.htmlIn 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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10548 bytes
SHA-256: d061aea9ea8755e4ad4aa685be3f0699ce624a5fd8e88ab8a1df4e4646713b44
font_02_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 17112 bytes
SHA-256: 833c9273109a076997ab2a323b949c6475751eae831659f897b1aa609d9f656f