Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b8ab817f5104ae…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 05:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2fe5309ffdb17fae3760b24364ab6ff SHA-1: 301ab61ace4b2b1aeafab3c76c6ac4e734b85573 SHA-256: d8b8ab817f5104ae688e42a9853d1172ac8fcc964732cefda1484275341e1aa0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link farm point towards an attempt to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.tunnel.de/files/uploaded/file/zinasejuda.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///toworuwowimonizikowofafa.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210917144233.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/98239942800.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • http://full814.com/upload/files/gadadibutilujosurojofise.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e689c4b76---jowovipizagexekadinawekef.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa666d41f---mavesopowofoditi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6f93p3cmu0vemqmo0pv28sjb20/40976645258.pdfIn PDF document text
    • https://equinox-e.com/upload/files/sufiporefin.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/dukolaxazekosodejel.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/duwodikozimas.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/75205094190.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/mimeximosenaverafomu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/zatekoxibuzoposekamowo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wasabokiw.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/812894867.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210903154637.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zegisovurebar.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/34755526942.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/vazepukudejisapojokupaj.pdfIn PDF document text
    • http://iscelenie.info/files/file/kuwezixelolibajijesakenak.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/63037299568.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/12254267156.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/82409640865.pdfIn PDF document text
    • http://newcityhk.com/userfiles/lekuzavamepipeboxenijeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=world+time+apkPDF 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 10368 bytes
SHA-256: 31ae08bb8a8777aadc2f9950e0b867ae076107edc85695f82e5c8c3069e6987c
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 19296 bytes
SHA-256: 0c65d89b830c242eae77d701d1f43680af5d1db07167bd87de914a08bca802ae

Open this report in the interactive analyzer, or submit your own file for analysis.