Malicious PDF — malware analysis report

Static analysis result for SHA-256 6881b2dfc8bf76cd…

MALICIOUS

PDF

94.7 KB Created: 2021-07-05 00:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c58066952f9a428f8120362fcc0b22b SHA-1: 6c361663071af94ada9ffe6fc1fd59dae63e18ed SHA-256: 6881b2dfc8bf76cdd5650c319223e9d60f8c1ed7bd6f44c1072572b3fa067f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b632af0ad---59819275796.pdf In PDF document text
    • http://bpsstudio.hu/uploads/78662279878.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/49981318998.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160804b2676805---bijakudemutuwaru.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/boxapoxadupoledexi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7172ec119---93561131506.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6e99225d09fda4855ec5fca3f955bbaf/4777868872.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/80524401791.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/9887007426.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e336e4546c---xusuvikevironexikexozifa.pdfIn PDF document text
    • https://computerzone.pk/file/52321566993.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/jiwesinujuw.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/rqbk3373t8q93ph65q155q0vus/futuginimiwumafemi.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/10525285154.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/noginifegatoxow.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/8850877248.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/nuvujojalesadebezorol.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607055739da47---38545141822.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/13208597484.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/11795375582.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/66838434715.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/0fbf672dd6e240f35f76e84f9243e5d6/77009115454.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f579760494---35423951093.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/23ca42dc0b02cb0b2b0dbbb63e215212/mirir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+many+letters+are+in+the+cambodian+alphabetPDF 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_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 20440 bytes
SHA-256: c6ee3c0d245473c38203583c60ec9d88c6eecff7ce09732161137c5059a60742
font_01_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 11112 bytes
SHA-256: dc8585fecab52db9c8dd3697e423be5bfe8ea3f3483f214370bea5e881ded58b
font_03_sfnt_off0001548c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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