Malicious PDF — malware analysis report

Static analysis result for SHA-256 db18dfcd45301a1b…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 16:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8aabe763c24b0426e955b495a21171dd SHA-1: e56f05a5f8a7b033dcc98f001b28d6d583e94f50 SHA-256: db18dfcd45301a1b6f5acc94fec67c649189c5584a09fdf899d5cea325074c52
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=kittens+dying+one+by+one PDF link annotation
    • http://promocode.lu/userfiles/files/83048411394.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ibileguzutuvidowunem.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/13185084476.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf809ee10f---wugogit.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/32662149514.pdfIn PDF document text
    • http://mfahk.com/upload/files/jozivulemolawifolis.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b00cgrtbo9udvrm7i9s6mp4pnl/68885667182.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/38940446634af08bf56f2cb2f98b40bd/sufuzofusibug.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762fcc1a499---lojekazapebonu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823c7d30ff6---jikibililagixaxiteriguga.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160917de9efc96---63793384869.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/12213835697.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/bogivalajelizesuxidov.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/xopapik.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882c2052f9---3831903179.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/46190751819.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3674e36ad0---91383265451.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/8dc37e63345789c58ed5b93ca8b75a06/rurulotoz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8j5bfuiljibcsum2amlck40ee0/sapefumodagokin.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/zojogezopumolibidivi.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/foxaboxogegafowexu.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210626_CA06506A2FB55B8D.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/cc633676c67b8ffd49b441ae21d3cebb/sufukavizinizav.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/26027619779.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_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10360 bytes
SHA-256: 6e9e1076febfcd8baf7ed0070d8d499de0c2e1ee55769a25bc521956785e3085
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 17896 bytes
SHA-256: 69fdbb0957fa28a7d21f6c889553a3c5ca434f1a2914259beee9b90c56d40d7b

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