Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b6cf586ce3a399…

MALICIOUS

PDF

87.9 KB Created: 2021-09-24 11:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 506ef32cd066d8d01ba192a767c21a81 SHA-1: cce9564c76082eb23aa73671714300d84ade5f4d SHA-256: b9b6cf586ce3a399c2a0537c2f9e884e827869a5f2d38b8089a5dfc183de1088
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan detection. Static analysis reveals it functions as a link farm, directing users to multiple suspicious URLs, including one hosted on a compromised WordPress site. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3031

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://inwebjor.ru/uplcv?utm_term=after+full+movie+123movies PDF link annotation
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/92473556711.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/nulunimugevopaju.pdfIn PDF document text
    • http://archive-2013.humandoc.pl/attachments/file/86588610451.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161314401c7811---zonunigutu.pdfIn PDF document text
    • http://denge.aero/upload/files/83119406315.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/62631349344.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/32025389683.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/pobufuxide.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xuxegutuxovolijo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/86438251236.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/98692273722.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135e987238d9---82295429695.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904162538405.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/gaweniv.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/patoroluwepaf.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sewavevak.pdfIn PDF document text
    • http://alltechsro.cz/files/zebewaloveduko.pdfIn PDF document text
    • https://arteziano.ru/ckfinder/userfiles/files/73086774159.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/gelarepajofenusotilebuxe.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/23338099433.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/93b1c3d08a70538306510724789f3a0d/sujotisawujejolab.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/ganaruralexejamuf.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/livukelunufavaj.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 17228 bytes
SHA-256: b4f8a3f330b6dacb3a97e7f851a63788c8623eb8b654a8882c192346c8717ed2
font_01_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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