Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8842633ef9c244…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 10:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 2a15da77b16fc8262bec00a114f53cee SHA-1: 92cfeecd7ee5038334597da77da11c461826e78a SHA-256: 2c8842633ef9c244a622268576a304b2f6c98a0da5736da0d9413ad5c00f4ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kristenpell.com/userfiles/files/33191961072.pdf In PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/17046473591.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/vegikevof.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/xuluwatumesupekemowo.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/tadotelikagume.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b759f21f439---1571029251.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/50108992884.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/49365074197.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/23863131709.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/52877938895.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/tukoxudise.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/sesepevidawaxodavisexe.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f210a18045---62076093227.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/girofowajuguki.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a23f09cf---xulotunexejitoguxowen.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82177646be---belitigopenejojixapaza.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607490b7aed8e---4839981812.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8245b037c1694ab04d56b1d11b7334ee/1255664870.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/27602730799.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d46dc887c---kevekanijupewixukida.pdfIn PDF document text
    • http://edelstar-mos.ru/files/84954142709.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/zatuloxojizigepuxe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d7b991b2f2506b262b36ffdc4326c78/tamivosagitutugika.pdfIn PDF document text
    • http://quaint-house.com/54486612165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nikon+digital+camera+d7200+n1406+manualPDF 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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 11304 bytes
SHA-256: b10b10865f259ea4d4e58795e0c64e200340785a4a71dbc3ebe0e05946ec0596
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 17564 bytes
SHA-256: d7817bb1aca5ae9ab4916148d7951b93f2077894fa2aa9c4bb4a82c18cf2911e
font_02_sfnt_off00013154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1