Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b0b8e1393da4e8…

MALICIOUS

PDF

60.9 KB Created: 2021-10-20 15:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 814ba10effcf190f422c2103242f76c5 SHA-1: 585996778b8a84d7831aa3eac640c24a1e01fb6f SHA-256: 59b0b8e1393da4e8151c9be9b95366703c3de321630517852d83e5796bbb5d95
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=the+legend+of+bhagat+singh+mp3 PDF link annotation
    • http://fitviewer.de/files/file/58818957294.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/wigezerubajegewuzajenud.pdfIn PDF document text
    • http://zeci.nl/im/image/27413455280.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f9ea8207c3466b100c7c5688bd1c1e32/71393064360.pdfIn PDF document text
    • https://lazerom.pro/media/file/50426814346.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/36290893324.pdfIn PDF document text
    • http://intertravel.hu/_user/file/80700875024.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/11194858533.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/54852735269.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/48360022803.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191710249569.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/88309886430.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/9908466771.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/86150573126.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/damili.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/sogutawoxijakozelewixub.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158abe77428f---gosujunisovasujer.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ef2429a967b83d3f82669b0f2933fd7e/72452365322.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d1b0409---40659612691.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/sasatutagilesimopuwo.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebasira.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/gamejiz.pdfIn PDF document text
    • https://rippa.pt/files/file/sexes.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 16976 bytes
SHA-256: c036aadb5af4b7be8ef1b7d642e8faf6fe18b99e8dbb0ffa98eaf514dbb0fb4a

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