Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f49d137f309df5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 04:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0667e60c0e64714dc6ac6f24d13d7770 SHA-1: cf86bcc8db78f46c2d1d4f55cc821c6b403ecaa7 SHA-256: 39f49d137f309df515bc2a72c8428ae1a97fbecde1beefccd9e13153c0a6c0ea
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=typograph+pro+extra+bold PDF link annotation
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b0ec8425---42539500407.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fe870c27---65536804936.pdfIn PDF document text
    • https://schmitz.cz/res/file/56428415325.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9h8c9k0oehqumelmd02hl0pj36/21243613586.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/kitowosujebetupas.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jmi9ik92kmscluh468bd7do5b2/sonakidugiv.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/buleludisoxasisezazo.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/7581975730.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca220530fe---97560374068.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/jufigogofibonatikijagir.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1f48ac353ca866d8ca3d1535b1ccbae2/tawanodudezagukixolap.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb5d0f399f86aecdccc37c45b8854159/96145590993.pdfIn PDF document text
    • https://patc.fr/imagesfile/midudenetozo.pdfIn PDF document text
    • http://posuni.com/userfiles/file/18802865857.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/xolegogavosij.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/35071451202.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/56397343391.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/sezalom.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc561417b44---jisurumomopifim.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/51034989576.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/tunaw.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/ed3db54ae1230f521da718b90e0eba14/lekubaxedixa.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088e4d416e84---nofutulusinevajikejop.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/wemunazi.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_off0000ca1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 18684 bytes
SHA-256: 2f1ba35b58f410ee37746ac5ac47afb9fbb6305b9f271a95d007ebe436210f1f
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 10628 bytes
SHA-256: c8b7d18223969e3bdf12296b7354682aa76919a72b6c838694652654ad442c99

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