Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b9643639174c4e…

MALICIOUS

PDF

87.5 KB Created: 2021-08-20 03:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a535634aef50aec8ad47209260e7307 SHA-1: 5c6e79148b0c8f0c45dbef24ade9d94728c3c531 SHA-256: 28b9643639174c4e6cb1b21b573ab7d5aec477fc588cefa9af1adc571cc811cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bb32fb12f71---tibaxewowopufoliwuretel.pdf In PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1da2ubvtcfklqah9b577a7eps4/dotibusa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2846e427b---9283633672.pdfIn PDF document text
    • http://poiskvod.ru/images/file/bowirosesiwisetuva.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/56189664983.pdfIn PDF document text
    • http://vhshf.de/File/pipufakigaze.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/71881259202.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/67432423448.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70109b8d7---59573165905.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/28889573912.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8907505b804165f00ab9d221ae612af5/moripogaxozudi.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210703_05280BEB3171D942.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3a44e755fe080204b0c6a92f98d992d9/kunebuf.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/70757745335.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/wowolavokem.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787e9e9a1e9---zuxanasezopekatufukodekof.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/37430012887.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/14101059722.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/zugasadej.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d0ae2f1b99aa604db8d5fbf4421d22d7/pudifuniwuwediragex.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/88ab38c17c122129095322c7af4c1bdf/78635726179.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/teruvegunogoka.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/kisipejuzumito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+track+blood+pressure+on+virgin+pulsePDF 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_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16992 bytes
SHA-256: c986debe2079fd5fd195964199f553fb36bf15745fdbb0f6155ae173cf9a07df
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 11164 bytes
SHA-256: d207b01ef394c52cd43dd0d8ff5c0f719aa52552dfdbf9c908a9f75eaee75a4e