Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1fe26b9b2be4e7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 16:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe2be3d3d11b32636eb1edd8d498ad38 SHA-1: f5fa53c1a55a2a29db1abaf42f488fac7ee3e6e2 SHA-256: 9c1fe26b9b2be4e7148380740ca84e5fe592c5522dae01d05eca66f3be9acc48
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=britney+spears+and+stephen+dorff PDF link annotation
    • http://beachhigh65.com/clients/879402/File/jekojukodo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/75b15dad68a816415e90c2b6fab1cd89/pogipijapugepekupab.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b138a8016---65643037710.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/golum.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a65bbcb2ff457fd914c1a588cbcc5cc7/leguvezonawelelox.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/opbbanlv6c2kv217j6s8f4blh2/kagorisetelowisas.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/feriteku.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/28707948541.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/90613295789.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/95888686843.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/90113051809.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wunapenimeminonozizesi.pdfIn PDF document text
    • https://yellowstonewildlife.com/1945673398.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608926adf2b9d---webefukuzupenonobured.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02028b1650---16607879548.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3df10245bab64a74631c537dbefb37ed/13799283573.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/21471046857.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gapobopibes.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2u8gmap0n1qkv9q2cvmsjg6m7/22648801154.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f98c4bf39---belojavisuseg.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/34acdd6987f609b99875431d9812026b/38210286488.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/nalugoxodatozu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b82e2a4a9---devuzijamelobafulixu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 10716 bytes
SHA-256: 42e9bfed84347b201596a2744bab434ba9668fd4e5d60d39d6a0718c305f965e
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 21840 bytes
SHA-256: 20b32fbb179a8ebeb1e18a6b1e472ee494f11d6c1e77e4695e424cc4063d6a0e
font_02_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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