Malicious PDF — malware analysis report

Static analysis result for SHA-256 3046cdfc7a0b2a84…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 16:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56dbb85bb6d5d963cc72fd043f45c959 SHA-1: a729185af6dc258048e9f3034ceb5ab8cff41fe8 SHA-256: 3046cdfc7a0b2a84ec90d974bfbf1c0fc7d2064cf9a87609c6dd70949ca5ee8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=best+pdf+viewer+macbook PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jbklc1h9cpr6mf7t1amletb9a1/94264642869.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/49040877585.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/69166723249.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/5319203425.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/weziwer.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/venumovolaxunu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606c84ad44c50---49438833791.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/572925100797aebd4792286d1ef86135/50907256296.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/gotufosijekidinilu.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/jikopemusuwam.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/mepisusep.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/23486799564.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210728_FB4045EC110735D0.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/19052268291.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/25130034309.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/sokutiramenenekerenexir.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/83467692102.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506040615.pdfIn PDF document text
    • http://tfforming.ru/d/files/75673649338.pdfIn PDF document text
    • https://artenika.pl/fck/file/zuled.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/55316535492.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ef5c2d64959426aef016dbe069cb2bd9/49064369045.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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 18296 bytes
SHA-256: 63f137cad96a7d0da861041fb1598f73a51df293baa1817b6a76e694791ab375
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 11068 bytes
SHA-256: fd4815bce695dfdac207447ff65ccc07f0d5a8b92712283ca2d33ce021fcee33