Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebd033014423331…

MALICIOUS

PDF

69.0 KB Created: 2021-09-23 21:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3f5ef14fc25589429dd0fb0f058d6d4 SHA-1: 4998d9d31bc5801743a0984b15b83f5cf1a13476 SHA-256: 7ebd0330144233317c4e1dc62d341a756b3e0083e71421ce9933ccdc7c453ace
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sanipro.ma/app/webroot/uploaderfiles/tuxaroworebupumivobesofa.pdf In PDF document text
    • https://kaowei.tw/image/files/20210914_183203.pdfIn PDF document text
    • https://digireg.com/upload/dopivabibizuketutofimebir.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/kiwobupeseke.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/87338763127.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/xovifi.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zuliwetoze.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/zutej.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/ludedorexavilebiv.pdfIn PDF document text
    • https://telenovella-bg.com/files/59917687596.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/59843087494.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487a5a46a---reripuja.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/wiwojuvu.pdfIn PDF document text
    • https://upaspor.com/resimler/files/8433235726.pdfIn PDF document text
    • http://glassick.com/userfiles/file/42603426500.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/41305370426.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/petagesalivifevovurufi.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2ebec503b6c4f3d23243d2bdca159587/popegofidebofakidexasijix.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377b00df489---35234089459.pdfIn PDF document text
    • https://manenshop.com/upload/files/79120700644.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/gurojitaliraditudesoveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+k20+pro+vs+mi+10iPDF 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_off0000ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8D 10640 bytes
SHA-256: 2e4d9291287ee99e3e328a7960ef078faccf143d7cdbb4c7f6e320e14745e88e
font_01_sfnt_off0000c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 16000 bytes
SHA-256: 460ab1a50a2289eca0ba5248db043eed3695ee71b472c28abd2d4d4e510a6053