Malicious PDF — malware analysis report

Static analysis result for SHA-256 a527348b27c15fc9…

MALICIOUS

PDF

94.9 KB Created: 2021-07-02 03:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a5b4d47b30d2e5903514fa47655188d SHA-1: ad74c6c4109e33b88629367ac042c00631917ba2 SHA-256: a527348b27c15fc9f37446fd2c0c31395628f7dc19da3459149e63cd1d37d0d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating it functions as a link farm. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://learnazia.com/fck/imagesfile/17565001181.pdf In PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/pinidawa.pdfIn PDF document text
    • http://delve-cr.com/uploads/28965648067.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c453e913fc3---gelisuzevaleledofexij.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/9753047728.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/83f72b78fd6c03da90773d1ec376a23a/30657502455.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/51208251408.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/golusegafivinixe.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b179c01721---87805096604.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/59789059716.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/83943934191.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d65d93edc91fff0fc9e717b260c20f3b/73290627454.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/5f1ef71f54d130252b5944387ce68fcd/jinekijoxuputube.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/giwinigoderixuwoton.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a91d829240a---19300440535.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607216facb03e---fawezonojobutejiwexitax.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qsc31fo7b841vd4lj9abgf3ohn/xiberivapa.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/tadalitufurakifimaso.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/loxubuxutipizowesefi.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/dubenawuse.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a0be339434fec7339cd5ab1757815a64/22815354447.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/10236149594.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qa351dnajl8u3e2lqpe8tba5cg/nowifokares.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=steph+curry%27s+wingspanPDF 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_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 19148 bytes
SHA-256: d387e3c7104c7c94043c838baf2295e6bb52402d0d6fb565b9f05e8134f55ac7
font_01_sfnt_off00013be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE2 10896 bytes
SHA-256: 07fee57b95907aca126198bcf4fa0a4b50db85d183f35b26576e57af75d4070d
font_02_sfnt_off00015531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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