Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bec921d838e37b…

MALICIOUS

PDF

102.1 KB Created: 2021-09-07 19:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eb24bdbe58c2e5d21b1d851057d287d SHA-1: 1086ad1c9171c5d60a441f68df0ebcc4c3015c74 SHA-256: b7bec921d838e37b5e013d5370587caaee9209fd3604820c46443c8e4d81d08c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

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 https://oniceh.ru/uplcv?utm_term=the+great+gatsby+pdf+drive PDF link annotation
    • http://simonhoirup.dk/userfiles/file/56142536852.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/39544745687.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/27361170818.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/vetawere.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926cdd54b9b---5653404576.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/magonupawinawirotabo.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/95116955636.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524411f408---60188618302.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c0e3d00ab---penudogo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/93853834394.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0737c86945---46417830845.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607696b43199a---firalubapa.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/51124953686.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210619114823.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609093abbf22b---meziluf.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/18265173122.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/dazonodomo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/20f233ab7320a3f8d733cceeac9c6cdc/61599259563.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/woliwujovusejaxuzilutap.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/3758428055.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/sukolovodirutafuridejo.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/fotovulos.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/7831503609.pdfIn PDF document text
    • 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_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FA 18572 bytes
SHA-256: e5c9cb7cfd9503623aca576c6bf98c532dc555711a9264344ceeb25bd23f7318
font_02_sfnt_off0001722d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722D 10788 bytes
SHA-256: cb4e7771550480977b6539b8af00e5dbf02ea34a660bc9b80872d8d4040e6ab3

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