Malicious PDF — malware analysis report

Static analysis result for SHA-256 de574dbc6f6fd262…

MALICIOUS

PDF

80.8 KB Created: 2021-08-27 20:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 891522e1c75954673802a99d015fb4b2 SHA-1: e1aa605d64a1fe64fd265e3baccf5d97754e2941 SHA-256: de574dbc6f6fd2628ff4eae951f660917a44e9301ef8145c28da9892f19bc4d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a compromised CMS upload link. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs pointing to potentially compromised or disposable domains suggests an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://self119.net/upload/userfiles/2021/07/files/210714073037.pdf In PDF document text
    • https://atl-50.com/files/file/65022939157.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5a9270a2c870d4a123bbe38a8db65d42/dewolubotorofared.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/v1l2k9uf5sjkl3ugrdbi78770e/gobemenidisixigeke.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4e232ffd---14561702057.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/43016857707.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/peguji.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160713c9c3e6b1---forop.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c4e22c42---ribawexavewopelo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a0554b171e0be31ab0c8b389e52d3157/tulusovixagidagapu.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/13314741249.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/sunelav.pdfIn PDF document text
    • http://attlas.center/userfiles/file/tinaripepiretofotalib.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/18bec71d8a87f67736a5c7e7748cb387/bosaxopoxebalatinevir.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/89801716805.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/18231006359.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1629834230360723278.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/punalux.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/82890852903.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0811a3a5---ninoxoligulariri.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607947fe03e73---mebixusefurawazikifadumu.pdfIn PDF document text
    • https://motoralbini.it/files/file/daxorakur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lecturer+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 10160 bytes
SHA-256: 71c9bc2d9da00611cb6dbb343bc6928a2e12d2e63412db8aea636c68033cbf05
font_02_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 18252 bytes
SHA-256: f901eca07e3cbdc7d60a2c2f19c4d90cda345a8214a59121a12b7baf3b6ac397
font_03_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 16524 bytes
SHA-256: 3cdf4f8f4dce7a464fe4e8ceb6988aa5bf7bbea20165803f235b519784394ddd

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