Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3d3c0d7df57501…

MALICIOUS

PDF

91.3 KB Created: 2021-07-25 16:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6b86cc28947937912570822cbd825bf SHA-1: 3125ba1487a6231946ccbabf979cf78ae689a134 SHA-256: 9e3d3c0d7df57501a8b42ed4cfb2399586129ba3d233cd89634c8f722376445c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many pointing to potentially disposable hosting, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://greenlivinggarden.com/htdocs/UserFiles/file/39048920964.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98381932d2---50807851556.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d95f5eddb14134baf0b49a41a1f8affa/piletuxanenokag.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/sumadonetuxuzasaxisofejam.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9b881901b994ddd98059401cfca03a0/94331668069.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a105c417e397452cec5d102877bbc1da/ragupawekizipeju.pdfIn PDF document text
    • https://senhewood.com/d/files/zuripevil.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f4e315c9---ravediwuwegibagiwej.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d7a6fc8149082e9c4c5c6d85c8f6a1f7/35437340809.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4dc37fdf6---27190595741.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/eea25f248345a561194df9971866dd95/gobaxavulisuzofep.pdfIn PDF document text
    • http://mega.kz/media/upload/files/fexakomekibavezifa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086a293254e2---82631137042.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607816764c5c2---30580408587.pdfIn PDF document text
    • https://hoalavender.net/upload/files/tovezikevenafimabama.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/davufotebepa.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kiwagekalewutesitagep.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160985e3156fe5---7760749586.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jbcs5llf5utrc6oiv4dd29ots5/41832140024.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/33b26bb6c3870149fb92e0587e87abd7/tubepozise.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/8404165570.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210705092156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+enlace+qu%C3%ADmico+4+eso+pdf+resueltosPDF 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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 18500 bytes
SHA-256: 65e1724c21ae9056365f541acc73941dec8f7ba808b5dc140947cae45649b20c
font_01_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 11280 bytes
SHA-256: ff11df6087d29b2add601386c3e4ff131dda681fee48d262683a37d6f01580f3
font_02_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_03_sfnt_off000144dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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