Malicious PDF — malware analysis report

Static analysis result for SHA-256 973eada6fb5fd28e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 10:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a0f6f920e66b3396c07beacf45afbaf SHA-1: 63babfb13ae4f81497841b43e00236bfe9bb3304 SHA-256: 973eada6fb5fd28e62cbd01ce9723270023df889735817ee89bf4f5eb2ffaf06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous unknown URLs suggests an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://advertisementnepal.com/ckfinder/userfiles/files/kobovozurafop.pdf In PDF document text
    • http://centralgiving.com/media/userfiles/file/kenolo.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/genamaterinosatefoxepo.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/77095343156.pdfIn PDF document text
    • http://teknis.it/userfiles/files/25629717544.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oc6sl5apr89hq47b1krnlemp1q/zomidavusaberobataj.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/57isodud08vt0cu76g60v9jrno/52567234682.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/tizefekovawonetik.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e0fddb907ca35a82e2d817c9eb8fea02/51741281171.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160755e8fa940f---54100966361.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/23348233441.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/sezokevo.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607902f74b5f4---sedotigegagisuman.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lokazow.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/gatupapemoxonukixadosinar.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/1062294822.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/fozunajudobujavuteba.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d16b12bdd7011de1ab2bfd3a842298ad/83195721868.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/favifegud.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8c1d2f588ce071ae494fb25e901d2a94/20038234462.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a199252742f0bab87d760c52ef9a9bb9/86543324561.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d194a4b95d---jigema.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ca2ad4ea---koxolelimig.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210809144531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+new+mean+and+standard+deviationPDF 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_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 10612 bytes
SHA-256: 3108d581415a70c0306224391d62ad0280b5fb45d8155e531a57fd5399203420
font_01_sfnt_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 18428 bytes
SHA-256: b2d8f0ddf90c52f62112f37e061faa798ef375c8fec09eef26a81e5e4d7d3f8c
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1