Malicious PDF — malware analysis report

Static analysis result for SHA-256 3660758d6ba4b6ee…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 09:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0634f0db9084a630fb98d41896cd3565 SHA-1: eb3fb299ffe97f8ada126f9c22fa65ec37ec1993 SHA-256: 3660758d6ba4b6ee70253da89f241df6259c7074e557c8e3be8d82bb5162db8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links indicate a likely intent to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 http://aivieksteslaivas.lv/userfiles/file/zakedexiwosadunadiruboloj.pdf In PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/87936056803.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c21883523---35120456933.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c1120651---88476606424.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/bagowatibopugemud.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738263126cf---91434380878.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/bbff0ce29b5a03bff81d1bd723b3f2f9/73744954156.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/10993434678.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/63062882862.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777afac7a20---18306586878.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa27a382ea9---64014821445.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dd1baf945331f2531f448019474a0715/71699980251.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ba1m2etqbs7ji8sjd0qdh2hce5/loxajenolemodefezuwobewiz.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/popizonaropexowe.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/55b7e5ddcf05b9a2983a0a5aa474be52/64826521011.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493d9dadca---56200700094.pdfIn PDF document text
    • https://termofriz.rs//files/96194483371.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nfu0j1u12kmi3cn4p5u042mu66/59190008801.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/dc9d69243c2a3a0187cd7596b8ec9316/22952815240.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833e2f94618---bewozojawo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087473461e02---rilefumaliweninavugo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a1dce649---suvelufij.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/navubakokukavegabodixule.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/22358269569.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c3b312818f066f44f93fe1e356929024/67266288505.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef0f4779f---kovupat.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/af6e99ac86c513304071c9f416a7ac70/tixetemotujumudataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sst+class+10+reference+book+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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 17312 bytes
SHA-256: 2eaabdd38f9efa4eefad8afd79dc9c31e7632bb50e4cc7c690616c2927a2838e
font_01_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 11000 bytes
SHA-256: 3b2b5ff0f663f5c65906dd9e03061b670f13d551818ff6aa75d03b3a4e2bd7b0

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