Malicious PDF — malware analysis report

Static analysis result for SHA-256 8758ac9f08d3b2b2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 15:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7da8b036c1296f6c70162facecb89d39 SHA-1: ea85cc2819196cbb0330a3be8206583a0822a350 SHA-256: 8758ac9f08d3b2b2b620ef83978263ce6e466cb327458185bf1fbef832ee4de6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=best+battle+royale+games+iphone PDF link annotation
    • http://wwpokebar.com/uploads/files/75521531184.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/sosivumokuguje.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f568a2a3---kakadag.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zilomagikakuzibupib.pdfIn PDF document text
    • https://vpmemorial.net/images/file/towatojakiwekodekugib.pdfIn PDF document text
    • http://ergakiland.ru/files/files/sopirozununupuvo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/pbc9pbqlo752g9m73hcp4qs1vk/91207154459.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/nojedumawibopemamikakox.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/79621578232.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gepakixenuvor.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/vojazubep.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/winarinugotekulasutelobu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/mozuxunadewidivu.pdfIn PDF document text
    • https://senfina.top/uploads/files/nevilamobebesaxidamivaki.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/41717028768.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/46711106205.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/54541575959.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/dagizelijezitakoxe.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/nolekigu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/87626888494.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/14540716766.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/relagozera.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/risizojegerolumal.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/420b7b2622c970319a50ca0e957579be/45571635847.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/lasixogozowurifub.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/fofalebugufoxaxigisiwe.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/mulugodaburobebes.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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 17372 bytes
SHA-256: 25084d040167e5d3eb9797504dff92c672af507fd421a3224bc77d240b93c569
font_01_sfnt_off0001185b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 11008 bytes
SHA-256: c8447c3468b75e8e44ceb3881ad83074769373684ea527597f67a58325b26c2f

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