Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cc24de6b3d8ca0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe4018315339f0f5f7642d3f86f32441 SHA-1: 9ababe6b1cfa5d9a8f6d26cf1e20fa0a35cc06ae SHA-256: d1cc24de6b3d8ca09123337ee06cb0073d202879acf593003261efca11baace0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://volandovia.it/public/fileeditor/file/dunejedosu.pdf In PDF document text
    • https://interstudy.net/userfiles/file/40992243641.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29706795311.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/48842019403.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210916_192131.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a308ee62---wajuwubexijajetigep.pdfIn PDF document text
    • http://stylekd.ru/files/rumijetexu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f095921331---zizebejutezajemon.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/30800613343.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/malakazuzosejusitat.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xatixojaxaraguwezidazerur.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/wiwidizejatumo.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/rurogotitosodo.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/ludagodovaxufulasemiv.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163058477918.pdfIn PDF document text
    • https://ever-progress.com/upload/files/gaxorad.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/22288017792.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/davejudi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07d8e0f4b---bozejog.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/xofen.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/13189022594.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/63059701516.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/56262287050.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/xogedoxepolajojita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=edit+game+data+android+without+rootPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 10652 bytes
SHA-256: 182c32e77ec108fd8c34be7ce4f73d13320b62739518982c7d2262dcb819869f
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 17840 bytes
SHA-256: 661826e89b7b68025f02c3d08177815acfaa3d401394ccfd792d7c053cfbe9e5

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