Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a821db6c917b33…

MALICIOUS

PDF

85.4 KB Created: 2021-08-26 02:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f5e1fcaba94ce8428bb2f2e5c620f05 SHA-1: 1abd66a3a4c8785863b24911e43d6340203c7ace SHA-256: 20a821db6c917b336ade7ddfb791694b2e06a6d6fb9e7269115421271ea5353e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests an intent to facilitate malicious actions, likely leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://linardi.ru/files/file/pudubunuwofudarupa.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/6902200594.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/35077247144.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c63697670be---sezoxuvirulutemevo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be2499a9c9e---segonalebojaf.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079485a6274c---zatesaridifojazuvin.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dde300be---71893176412.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/89836751031.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c223a1932---zuxodadigomokegagexewinob.pdfIn PDF document text
    • http://deauville.ru/files/file/fafakukugil.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b3a69ef73---76204890510.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/25549374186.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/nosobodotojevizanobezixoz.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/wudofuvogonisejuleku.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b28ee839e916938c9ed5acb7b9332112/lugosonufegelalusikasov.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mofowesukavirozixalapasaw.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/8367505912.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/59389247960.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccmrargtk581ev0stii21ro3c3/kifamovatosexuzilubovol.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/28244766625.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16248223461889577851.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210618_503DDD28706C0818.pdfIn PDF document text
    • https://activepymes.com/pub/file/55823230870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+ounces+of+water+does+it+take+to+make+a+gallonPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 17256 bytes
SHA-256: 510d51a8b68d2cdb45557efeecbebaa99fb2c44dafa2426f9e6b97669bd8c2d8
font_02_sfnt_off00012a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 11200 bytes
SHA-256: 4f00af911cee760c765261660a91695db6194dab818d2fabb48b1b59e80db662

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