Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e088a715be29a1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b77571d5f3e3d0a35df16cac52ce4c8e SHA-1: da870708e6ee4c2a10e5ac8dbfc4840019fc9e22 SHA-256: b7e088a715be29a1128ab00d716aac6974aaf83bd4ba7192f53070fc1adcbde1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or SEO manipulation tactic to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/71127322100.pdf In PDF document text
    • http://joltiy.ru/uploads/files/sujuzukabisevinetuniwefop.pdfIn PDF document text
    • https://digireg.ch/upload/wikuxiwakevor.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad22dd0c0---79240313704.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/gizojumegunavukolo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d356c93e---limuxalubolobu.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf73485e5---mijekabedonazufe.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/39538087842.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608780a68f13f---fasofur.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vedet.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/nofod.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/54182040872.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/subuwivejuvawije.pdfIn PDF document text
    • https://carlojans.com/cms/file/ripatuxemewabuguposom.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/bacauefouelibpj2b1ks0lk6r7/79563458074.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb62b40d3c---xijekugabamumuxo.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903192045137.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/u031giben5gaamqclc9p05t1q6/24907000707.pdfIn PDF document text
    • http://tochalco.com/uploads/files/xuvabef.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/nolanikapekodogujagux.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/80022657905.pdfIn PDF document text
    • https://panama4d.com/contents/files/jutoguselu.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/47588426846.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607522100f22c---88684892227.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a30dbbe603a8aa36e68971718e275707/mifefugajivaton.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3pcaeof7uk2r6o5qdj6936e5m1/xulewulovupaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+evolutionary+anthropology+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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 10964 bytes
SHA-256: b6fabae14c7db26a5cbe42c1183bd2a7fab0c5c3ef0577254db6387ed49076d0
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 17012 bytes
SHA-256: 90410a0e881b722228a07c12a013348b0478d0bf0da3be3320503e484fc017f0
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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