Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9d1870d1057129…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 17:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c45c756d0b62e7bed3c8eaa38b12a16c SHA-1: 7beb5e46cc0dc4d70aaf226dfca6d6d9387ca3dc SHA-256: 1a9d1870d1057129fd3d4202801605e532f16f3bd987e2c4460575f2f7556da6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f018de92a---modunekumelovesota.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbdf5b2523---relafataxibomejes.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4088704da0539880d896d1f26a6209ab/setunesovupujatopemesu.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/70490333850.pdfIn PDF document text
    • https://yuktogel.com/contents//files/vixoduzog.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/rejolafi.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160906216210c8---memukoxe.pdfIn PDF document text
    • http://contextuae.com/resimler/files/27453725646.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/34218566717.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5531aa91---33387142681.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/70279667118.pdfIn PDF document text
    • http://stonebreaker.at/71977488395.pdfIn PDF document text
    • https://istanajp2.com/contents//files/wupalenatironibenapeb.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/tsdjrl99m74vsgjhqiluftnj1d/kiketefawizekarezepa.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fiou865oflpjuhrnu6vpcc1clr/vizem.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/94103251118.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/disl0t9v17ob7kfgk5lhcf4ik6/difedoje.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/74794342626.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d397ae846---rufotapon.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/833ac57a3135e8f3800f27a74d65cd91/vijujapiparawafikugamu.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/86313499229.pdfIn PDF document text
    • https://alohasafaris.com/files/49139924197.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c58c223f---mijumaxibilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=competitive+programming+3+halim+pdfPDF 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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 18184 bytes
SHA-256: ecd3c87bba13e843713f736b931b31ce6c395bb917663c5e75953eb66cc89358
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 11044 bytes
SHA-256: ee80ed0f698e0f85fc64601ef679b3e3d7f8aea8e0a70de36442f33e03da3403
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1