Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3f73b954f385fc…

MALICIOUS

PDF

87.8 KB Created: 2021-09-11 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 341271937a72b6b45897d3bb1b00ea20 SHA-1: 35545c03eed2ffe69a06ec546f6af94d04db0fc0 SHA-256: 0f3f73b954f385fccee1c19c1a923ad8896a83dab36f726016dfc6181c465c03
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://greenways.at/userfiles/file/60850287279.pdf In PDF document text
    • http://alvitraders.com/files/29671649934.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/2756437922.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/botigesowixutitojaga.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880e04110e---weromubodazovipolovijibe.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/jaxeratesokukisomagofaro.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/a2d1bqqoeh2bufdqdm9d1ao15v/zizoxilidi.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/64197274412.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/gipawokepogixuxe.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///64666615048.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/13663204517.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zexubewugeg.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bexagulivakazaxasifod.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/navuwog.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/60041231911.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/11441876410.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/66753386889.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/40485208974.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd36ca1468---potivi.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/metotitizagesaxidakap.pdfIn PDF document text
    • https://hirurgija.me/files/danikonigaverofupo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903124813582.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/37824579006.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161300bbb58326---bokixanix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dont+breathe+123moviesPDF 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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 20244 bytes
SHA-256: 338209dd1029302a7961e5ee6cde70b1ebb20a502e18e8b037ef9a0728873064
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 10880 bytes
SHA-256: 66270a39bce830f05d164942c25eba8008058b6f4103c2764327e03ad2ede779

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