Malicious PDF — malware analysis report

Static analysis result for SHA-256 103a35df57751d45…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 01:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 61c422864a7651efe71f8af528076083 SHA-1: 3ccb4f99e420c2bdf4dd7c3fe2b2df61e3c09d69 SHA-256: 103a35df57751d4550a3f0df87eb26d2b4952527e0300e1c65bca1da2093e486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=optocoupler+application+note+pdf PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba095a1e5a---jipixogikag.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/ziles.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/30719976459.pdfIn PDF document text
    • http://gabortech.comadmin/file/27241316481.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrsj19eoqnjn8njj9if0d19gjd/92101263448.pdfIn PDF document text
    • http://jkohut.pl/file/96155746478.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd622988f---14251897858.pdfIn PDF document text
    • https://domilot.com/uploader/files/zuwab.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/44052635024.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/raponepitan.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uva662gkvb1op9mr8qdl7i8le7/41264208839.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e357bd8a---66482569748.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f95be9c04ae914e3fcc0fe44784bfc62/mepugiroleteguni.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/69261556620.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2e274e96---bidililigiralir.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108013e361f0---betokisanidaw.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93d98a8ce---fojujifowaduvedowig.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/5855534103.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/81077377399.pdfIn PDF document text
    • http://camonetinternational.com/files/file/9145199871.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff79a9884d5---62544954107.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nrhsl97rtjff4udv5j98vdpcc5/11055809848.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0a97qf93070d5n6shl66f58dl1/71561366028.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/19085541787.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_off0000ba21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA21 17508 bytes
SHA-256: 444853a6a31bf3688d9715f4e1b1ca8f25b142344d2fb888c2f45e81d36bbd4d
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10572 bytes
SHA-256: fc2b09795bc5c050685cedce622cd966ffdec94cfbfff4e20554bb8d4623b5a7
font_02_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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