Malicious PDF — malware analysis report

Static analysis result for SHA-256 136e18506bef15ce…

MALICIOUS

PDF

101.0 KB Created: 2021-07-26 22:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f4fbbe7d554890b3bdd6d0e90d4f4dc SHA-1: fc3ee1a741575f94f3d7fc998b2d2515d28cb8c8 SHA-256: 136e18506bef15ce32b95da906f92b8f2b6e052f1c770ac325a55e91f62ba0b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0, and an ML classifier also flagged it as malicious. The document body was unreadable, but the heuristics strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6c1bc1ff86b78f8b4032ab5edcd837d7/31414098596.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da2d1bc7d---20082017946.pdfIn PDF document text
    • http://sswjeans.com/files/nonovetogedibat.pdfIn PDF document text
    • http://yejida.com/userfiles/file/37050167081.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/99909763722.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/8047a550cd517c824e6a923c5e753026/liwifujazejame.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/30394028482.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b8eded0fdbe4ee2cbaf288693896bda3/63425536824.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d626a4f9f2044235a1af88f0f1f0411/selepusivaluragog.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7d34b31426b1d7ef843da0fa402ceff6/pefafesixijew.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ca0d6a278e71b722030735dc081de027/pubelalunabo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/72883887912.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/puwoxi.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/molisebefis.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uq5q7q8j5q8d7gopif7u3j21n5/6433764050.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/52850848115.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b4f657218---84204921755.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/prg1etn41pinb3h96hdgfsgpm6/pulaliwesumar.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609da110cd86a---71650451883.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71532154422.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/28300fd8f796733daed08849d666a532/bakigakuvulagesusuz.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/10796003532.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dp7ajoqhdoqvspgf72phhao997/59976255858.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/gadurifederosutuki.pdfIn PDF document text
    • http://apcmagon.com/userfiles/26673462088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+market+to+small+businessesPDF 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_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 10676 bytes
SHA-256: 7134c3c569d4d86016f4d219e3b94bccd109c8a6c4af7399a401ed6658eb74fd
font_01_sfnt_off000141a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159BB 16748 bytes
SHA-256: 7fb198b861f2f79ed82c46de7885e268c46fdbfed0f3b1725963a55a938cb4ea