Malicious PDF — malware analysis report

Static analysis result for SHA-256 46727e24345fb5a6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 12:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3525d4c41b38c5685e6d4e4cb41e7f2d SHA-1: 34653300734ae3cf50597fb6734c8c900c02dc28 SHA-256: 46727e24345fb5a62a819e6dbae5de519c44410fa749a99644ba3fff7e478ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://coretry.ru/uplcv?utm_term=ios+10+launcher+apk+download PDF link annotation
    • http://pscworld.eu/ckfinder/userfiles/files/57586884420.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161372e5c13198---mebidabulazukebenire.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/vunaxevexijan.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161317dfbe8745---mewiwo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af46ca7d53---xuvelazikaforobudu.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/38025455615.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/2985760637.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/34746421078.pdfIn PDF document text
    • https://lesura.net/userfiles/file/nubakarov.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bamolukug.pdfIn PDF document text
    • http://benetalent.com/upload/files/33773302452.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/53713701216.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/60059162279.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/12632624123.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8b8372a37---kavikuritalug.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2e4d90572672803e40644bbbb09809d2/sugot.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/58995060386.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sulaxidesu.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/31175838762.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3286b56---zamalagafasukib.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e3ccdc52---wusas.pdfIn PDF document text
    • https://revive.fashion/upload/files/luvikaji.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f4ee7d851ca1dadec20e287319d26b5c/93307099368.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337961b5727---12317408862.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 17980 bytes
SHA-256: 724308382e45d29913dc7031edd139931b1e36035fc5d92ca2683665046c0507
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10824 bytes
SHA-256: 84a4b831f4dd7b96ef8a47e84a1357d12ea62c5e0977c183594e100ce8871f3f
font_02_sfnt_off000129ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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