Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44a812af9c0fd47…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 12:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb53761689f99ac732446a26e3633c7c SHA-1: d97e7b0c04561e1326f815a117736e267f069e92 SHA-256: d44a812af9c0fd478ae1b08a5da57a3758b8e1506014a0ca1f73a90a882e43d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, some pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of external URIs and a link farm points towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://berettyotv.hu/userfiles/files/vivijiduta.pdf In PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_0C6EBF0D262CF56F.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c575b145e---zefujinutodamelobej.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/ruzejikelavagomukojivamok.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb400abc58e33be264081cbc0b3688e4/78107287521.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/goramet.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/gijiwegijigutejefifazige.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xenoxulasija.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/76499115691.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/98147204620.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/werekezewerimapes.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/95682231201.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/94434565100.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a10a2bdcb35de187ef3cad424a12835d/35950692499.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/levapipixexifafodoziba.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/33412443867.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/xunilotexetum.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9aa131ea---vamobaroremujokokuvivo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/58510637469.pdfIn PDF document text
    • https://basisangka.com/contents/files/36651637107.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/53595071439.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomozotetolubofevonokazu.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/sasidugubi.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/nawijag.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/tujikabimedejutebadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=moviemate+app+downloadPDF 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 10428 bytes
SHA-256: a8f25afd582958978a609270c15ff84239cbec4a968deb69b3d867be1220c749
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 18052 bytes
SHA-256: c1d492a206f4628e21f2f6ad602fe6f41bffb47e7a0210f4b7507aa4e2a47c24

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