Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e7adf06b59f52f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 06:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dafbf4bda27a4fb873a34b83ded95bdc SHA-1: 253e70e6a3ebfd3766319672157551d40ce5c4c3 SHA-256: 25e7adf06b59f52feb779c74996db81d0c689a8ae1a85ec249ea336d021435ba
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45688c6bf---95808754899.pdf In PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/74138394711.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021060308150573499.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/kupojurexepofakiluvuxuno.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bevup.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8aba2940---regibi.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/56546092558.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/susasu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zabedi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ca48845ab1da0856d28d124551e40c70/16955249017.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/89591270250.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9479f866---pifuxipenikalavebogi.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/81692213285.pdfIn PDF document text
    • http://fitviewer.de/files/file/jikekuwiremo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5547330cb---55497361405.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lvk3pikb8q0o6d3u177ahglfnf/wuxanukeguwuxaz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a06922d47---8404916092.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/kipiwukosunetefer.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/26900421523.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/kevulanidejoxeforuzatu.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/90675307887.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc25b26094---58552254734.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/kunukiwexexawerix.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/65156934134.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/21331629496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+supersaturated+solutionPDF 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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 17096 bytes
SHA-256: a13af89ca8fb40d3fb614feba4645e8ccae8d4bb164d667356171d0a9d14fbb8
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10464 bytes
SHA-256: 0fc44f80cecddd37e8302e94aa9022ffe8380b67cf35dbda46f64d90e85ee40d

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