Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ce77b876db3a57…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 11:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05b4f7d9aa599a2d17177b9ab87317f2 SHA-1: f8c8e5fd954f8c342f7a6857766df15d7340594e SHA-256: b8ce77b876db3a57c082f5fa4a25d179a224b8746a0b329f1dd262f4395955b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to obscure the ultimate malicious destination. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign, possibly using embedded scripts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://studiotecniconuti.it/userfiles/files/lamebepajirotit.pdf In PDF document text
    • http://hrudolf.com/userfiles/razapovetigomokumupulut.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ee96a8321bfa802dc94b1814aca3961a/48632686588.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/39765093951.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/venonamovorenof.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/pijovezamekarovovozel.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/42517042518.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1ca35e68c877e6a60654285c08552730/70890559310.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b86186d1fd4---35958484661.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/gijewifuwaxewexalawape.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8c8d6746---27634585848.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ce389bde5---9744656893.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xebipujituvuxozune.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zazobovizunatukozabiloke.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1tfb5si7su085qv031dj4tbepp/81967737864.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/44802801087.pdfIn PDF document text
    • https://aspirans.com/files/file/woturiwozefixa.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/xumawo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/72469389483.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/nutafofasomito.pdfIn PDF document text
    • http://4bx.pl/public/file/28874358207.pdfIn PDF document text
    • http://quaint-house.com/lazemumewuvagu.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/pizijikuruwibepapovip.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/kukemagabewis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=houghton+mifflin+math+grade+1+pdfPDF 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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 18104 bytes
SHA-256: 1f14c21e7233acb93084c8c70d3cce6ba93d5999966aa56b1aa4a94401b29106
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 10920 bytes
SHA-256: 8fac4e429cc424bee0e6557fefdf010f2f8c3c0b619ffa5c2a926ad76bb4db5e

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