Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95b8086571027bf…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 06:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfb8b74d986b9b8cce59958e1a196dab SHA-1: 5f247c6fd3c31f41f34c4e2f822818260a4b87b9 SHA-256: f95b8086571027bfa071c7be2c266a18b5aff676c694fd526d504ed06b16e3a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, specifically leveraging form-upload vulnerabilities in plugins like 'formcraft' and 'super-forms'. These links likely serve as a distribution point for further malicious content, indicated by the ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e7215e2d---4230135461.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b6e3ebdf618f9c28e39c3e308a8f216d/17941781374.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widotifuvezetapuwadu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc3598d82---78976023270.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/61531118748.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/kedun.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/702a99ee7f5e3d4ecc8db19851145a51/rezojafizimoriwodijatakax.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/romeluzafilabokabemozulum.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/woragogazigovex.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/65019065877.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af521c0d5---jupudamodedewimevamutexe.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/xekasefasiropimin.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/vetuxerofiwajufage.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/weses.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3fc9a1d7b---milumize.pdfIn PDF document text
    • http://turnyras.lt/Files/file/52466365074.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3dc27182c---32058596571.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/96903202556.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/xakerakefupovaba.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc7e975492---64295800320.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1848793951609b5e807a8c5.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210518024450_0x3d1m.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/34221496390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=speedtree+documentation+pdfPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 18544 bytes
SHA-256: 2d0eb076a4a5bb34db0965fbfe585b5807bb1f5703fb89d2c6bc2499d4cdfe4c
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10744 bytes
SHA-256: 98fe8d4dac28b26bffbe184bcd3b57e8651c4ef11f62164d3d8d973aefc0ebd4
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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