Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f3a96b1030b886…

MALICIOUS

PDF

105.7 KB Created: 2021-06-29 11:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6441b301010716e28e8f7c4b17e905d3 SHA-1: 7dbfd1f57dacacbf195fb0c283cfd995a34627d0 SHA-256: 69f3a96b1030b8860aab560fc62d15a954232c887ad823b4f8e4c538647c36f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to host malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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 https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3f718d90f53ba5294efc3cfad6a3dd0e/53975884240.pdf In PDF document text
    • http://www.urbanwaterways.info/files/91119013046.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/72872711144.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160836e5b31719---46406692220.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b636cb74281---14115286731.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792c5357d4f---bapesafikitowoju.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/bofotalanafoxu.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3400d42f4d1a106c78b2f1dee839e328/48219007649.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9d872c4e6---mukiwajafamaduditefi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tpf40aflr8k2t1qmp702nuerr2/sebupipamivudoxon.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5eba3e8c---20525522391.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/fikikevoguvomot.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8bc064f---73277173504.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/dj1q6b7vs5jg0k8m0beft7lpe7/6110260712.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8a19e1d9cc4c89cc975ab6d96056aa68/70817448740.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/ziwazekogoxago.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/35105630328.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaffa88f4---lixigunuja.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/1284267907.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e44uc2f4apipu8tqo5ueeff2nv/66665154591.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a173f3e2085---26505369314.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/29842132842.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4604353e91afb072f847ee8ab06077d1/rabixakikizabuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=turner+syndrome+congenital+heart+defectPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15087 17812 bytes
SHA-256: d19a3f7b833b550517a81b8cc0802372018a910bec6acc8f99e11f2c5f2749f0
font_03_sfnt_off00017f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F7A 11100 bytes
SHA-256: 5dcc6a5f249831dcc2a4d91942f972158ac3ae2866c43a52e7fd80b828f513a0