Malicious PDF — malware analysis report

Static analysis result for SHA-256 d242a08b86e5aba3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 21:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ddf86629a7a016c54069d3995ecdf24 SHA-1: 071e581daad9aff407ea4efdef376a595ca37e81 SHA-256: d242a08b86e5aba3282439e5d9ec9d95f2a6d8c326097b647fe6d1f4c78d2f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://coretry.ru/uplcv?utm_term=need+for+speed+mostwanted+blacklist PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160829cd24b2e2---24383478967.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/weware.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/58994696452.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pi73iqnu4h91kvktiga1cnt8j5/tejevi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161050f0d3251f---54209116229.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jusiditutegunir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfdac9c28c---nagerutotukikimo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/16jg4c3les0320f5apop2209sm/44106733495.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/dilifijazi.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/33049582823.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16074db918fc58---bipiwuvebenarivama.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/28823554485.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/pukipokuzojet.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/99bed04231b765b1fa96304c4cf7afd9/mudijemu.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/moferumugevifelemu.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/kusejemavetujuseberaretut.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/80121751394.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/94823205476.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e6f2e8685---34639431607.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvematoxuzaginima.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/58209471665.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1761c077---kolakituxoti.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d3c84a89---76375035140.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_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 19352 bytes
SHA-256: d89e77b925c75a31362a3b76feec7654076c7cf0e4d3319aafbf93f9ed0b2d67
font_02_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 11076 bytes
SHA-256: 00db037c09f5dea69b6deed09e0af4e52b3cbc47741833282b349f7dfa11ff3d

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