Malicious PDF — malware analysis report

Static analysis result for SHA-256 813be62dd4460371…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 12:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c7ff9c39d46bccabfc9899bd497c4eb SHA-1: 431f2edabb4e1386232b9f6e1d24aa985eaaf347 SHA-256: 813be62dd4460371d8c03c86a72100f71d0babc65f082d87d35c0adba9d0385e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://guclupin.com/calisma2/files/uploads/saxet.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fa25e05295352bc1917371281a0e0303/matedu.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/bemafekidowonalilovu.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suwogozoxuwijireziri.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/tuwofewikediwawigudegax.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0054af86d527cc61f8d343a612bcaaea/neziwuribosob.pdfIn PDF document text
    • https://sanidom.pl/img/file/zisidarujetopozavumot.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210511201932.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/36736857597.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/36759918255.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7ea751dd269331118e9f598a0f549432/gegurexukuk.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2af42c924---9138427175.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/sulisotut.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/sufaseweboma.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210829195511363793l2ewy.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/87029695382.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a83178d13---fufademuxasaseju.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050105206111.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106282304137469.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b83cdacb642---derukizezesijuluxesi.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/sadotidexibuzesusawo.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0khlopjjmeghn0514s3sfao95g/bewupakekalero.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/60234437287.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/fisupinamubedivulilenutu.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/38984128186.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cb5c6d305b1---39597796672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=capitalization+and+punctuation+test+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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 18936 bytes
SHA-256: 57531d0e55cc7939252c8cf6ad7da4b64c9b4df6e39c4083fafd898debd88e36
font_01_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 10704 bytes
SHA-256: ff939b1e9d950df039729c8490f14f5960ee201a0ca574180912d15612ac8bd3
font_02_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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