Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba3ba4be0091c2…

MALICIOUS

PDF

95.2 KB Created: 2021-06-08 20:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c211cdb6d03036f5e90a68d5eed078a3 SHA-1: 5f9c540d455a60b7b930b7a9429435b3de25056c SHA-256: a4ba3ba4be0091c2730968570bb96179ba84508265f98c33a85e271e90a512a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

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://medvor.ru/uplcv?utm_term=how+to+get+free+souls+in+mortal+kombat+mobile+2020 PDF link annotation
    • https://pharma-tools.eu/galeria/file/90659546832.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97b4ea613---mutojitalade.pdfIn PDF document text
    • http://liyangah.com/Upload/file/30982236103.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf41834e2d---fonuvefetoju.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/zobuzu.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/56393897858.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/60215576548.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b14b67b09---18807769636.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a47e87e3---95806431769.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/temolozaxadex.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609684d24054e---megekisewijaderom.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d84f049e---mewekukozugenasevefe.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/21b7205f00dc39e8cc86a756a2bbd213/giranojuromijatodewuda.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/roditukidime.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/07fcf45f8e11429659e86345b283fc96/64944655885.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d8373db9912ba9ab0f1da58c93fd9246/84940775665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 6384 bytes
SHA-256: 25c0bba19f432c36329fcb92034f94dd10b488a4dce69aacc8c0eb5d101bf100
font_01_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 6332 bytes
SHA-256: ffee81f1d2818d8a132d79ba943949af54eb29d1105b916f0141b8d734c593ec
font_02_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 5620 bytes
SHA-256: 371bcb35fcaf5287d01168d8a67018176e8ab3b87b8f6334fd36286b727220c3
font_03_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 2244 bytes
SHA-256: f7bf9c88a212caf9229e61c7eb619ec3a1f4042813f60f74c0945d96918be1bd
font_04_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 13028 bytes
SHA-256: 92a855ac04984d38ab374ea3c13d0200fb38df11f084e5cc6eb99fc473d9612b
font_05_sfnt_off000156b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B0 16080 bytes
SHA-256: 3a0f8ed008c79ef5fc1e40fbe805bb4ed86c3b537cef76351acb51b29d81aea7

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