Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ce841bb69cafb2…

MALICIOUS

PDF

95.2 KB Created: 2021-09-19 10:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2d0b073e72a6b869faa735391946365 SHA-1: 0a65e423d39e453c44f069c314bd857136418a74 SHA-256: 85ce841bb69cafb26fb951756b7ac49f33aa996ec93cffc7e5557b52b8a89621
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on compromised WordPress infrastructure, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the presence of numerous URLs pointing to potentially malicious PDF files suggests a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=root+switch+android PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce4d0278f---bifilo.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/pudiwufinakivagidoveza.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/jexamanoma.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/70474259603.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/zufodinukexi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/81004426827.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3fedcb242fb32785a17a5686e6c9e4c3/43740415990.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/miduzusojeguzom.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/xusexobeludimisewika.pdfIn PDF document text
    • http://belloverde.net/emailer/file/60069690013.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/mudexemolefaterefu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/fasibiwaxovom.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/tevunoguzaguras.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/81011434253.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01ba3406e---23708657243.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/33396932792.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/vebozikelaxovabafog.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/dukisibize.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/35892378677.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/govulojokegaxemexefuji.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/96988519353.pdfIn PDF document text
    • http://mfahk.com/upload/files/76564143844.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/65906259127.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_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 18824 bytes
SHA-256: 68fff443bd7c7f0ebcc91b94c734b6cc7cb25add422467f20d190fc92c89fecc
font_01_sfnt_off00013f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000157a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A9 10420 bytes
SHA-256: 873c4d6c4ab6cad0100252486bd380b30b36be31b4ab33459fdfdc667acb0f75

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