Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe0cd72267f1b9…

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 11:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 890feeb4eb04ff8b96e132e100fc401a SHA-1: 8ebe34ae955cafbe94b13b4a74c4a1ac915154f8 SHA-256: d9fe0cd72267f1b961f7576fc35f8fca0e0114d23a5fb4a2ec585f6b86003993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=do+mother+possums+leave+their+babies PDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a839d8f5---27283988853.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6e1499ca2ba4fd5f0c7ecf483cde5e4e/5282992460.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/fct5lem4f19rp7vf9t5f4mqrr7/vinawuriwalegujogigovana.pdfIn PDF document text
    • http://midel.me/userfiles/file/45137490653.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b8470b2307b4fac7c8c92d0903db69cb/88580202608.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/95271605018.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/et7bjdcfsdlvpeiq5btpsb61js/sodotun.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/36359873536.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ggs1ub8irhhi8m3gbtdbv16287/34522416370.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abddc7ccb21---20949667251.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc43e8814---58915000201.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b5a1d7f6a3bca378169c5047d4693d07/96417198780.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5634d7dbac---vugetekif.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac173653962---bimiguwoneteromoxaw.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/majoseziko.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/mafexewifolasodiritelapo.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/dumedivepovitu.pdfIn PDF document text
    • http://azizolace.cz/images/file/sebugejasavomagak.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/37dbmft7i9ke540humvumtc2k7/45835265116.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a4f89971---fofebet.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae2a4670e---87270460890.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2553df01f0---pifom.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3034116e7---tavaz.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4ace684608e1768b5be30d9ce4c5a090/fedevom.pdfIn PDF document text
    • http://geodez.com/pliki/file/71835641711.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_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 17124 bytes
SHA-256: a0922e73b510adb5c52d8de1bba54cce44cb2975d941ca31c08a12054c1bc805
font_01_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 10720 bytes
SHA-256: cc9d472dce5a58b07ed0d9f6f4cb63fb07eec505d2c9c7b917abb65ac8a7b43b
font_02_sfnt_off00013ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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