Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1852cdbc7078e2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 06:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b02a619ba2406b9437c3de0c2fbac73 SHA-1: 13e92fcb19df2802d631ac8478db14611b198110 SHA-256: 6d1852cdbc7078e2ba85ca7ed1078418f5cf6c1b292ed4ba1a3e089cdaca7e3a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 https://catamma.ru/uplcv?utm_term=lens+buddy+android+apk PDF link annotation
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36139284255.pdfIn PDF document text
    • http://abwva.com/uploads/files/84421363962.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/360223738b59f25708dc9296309838cb/salogupigimufonizabasudu.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/seraxav.pdfIn PDF document text
    • https://invision.buzyhub.com/files/jitefisewamavifunevano.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/bitisunaw.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/85978520725.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed95a0cdf---75435031503.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/63962011025.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7bf76369778d5f8d6abc00bebda5b181/jagoselejexisu.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/91486994633.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/78226256195.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/32058680478.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/46375919996.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/tezifori.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tupajamefavonezixatozuka.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f261fc08---82682316946.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/35015010466.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/88600586017.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vorojajasapasulek.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15244774895.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/24640280232.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/88804636099.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae46743dcd---dunusas.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/ketevewogagureloxosaje.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 18972 bytes
SHA-256: f0692c5ab03f3d421a5989b315d2f0a0af29895d8daa9d43e762a92394965d22
font_03_sfnt_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 10644 bytes
SHA-256: 73b922f32f7f5f7033d6a214e2093f1ef9fedea3963276062ed91a7f42ad72a2
font_04_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a

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