Malicious PDF — malware analysis report

Static analysis result for SHA-256 91abe3c56351b09c…

MALICIOUS

PDF

171.0 KB Created: 2021-06-28 00:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 374104942f82ef7d5b36c161784948cf SHA-1: 91d23bf0b74a1c345a089ca99f379631ed805eb8 SHA-256: 91abe3c56351b09c17316dc07fa18f770e3c18db830111ac26b2f4be35c87d85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to distribute further malware or phishing content. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, aligning with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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://pistant.ru/uplcv?utm_term=obed+edom+in+the+bible
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/367d470b886197b69b51bb3cbad349d4/tawipezufajok.pdf
    • https://nepalimodelagency.com/userfiles/file/91394297595.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a3710b023bf6b4f2d152633fa6727e16/begukimadavoleku.pdf
    • http://iphysiology.ru/upload/22481384599.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099262730262---64601597777.pdf
    • https://jjcfurnituremaker.com/userfiles/files/44917537276.pdf
    • https://cleaner.pl/userfiles/file/pupukonugolezomemuvugil.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/48d4dc7967f8bf5de5b6836ae2b3987f/55164677861.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tidugetofimazixisavudi.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aqdt3uo9hqk60i7eum6h7q5vve/56750028192.pdf
    • http://perles-del-beya.com/userfiles/file/nituxuwivujeram.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b6a81d45519826cd94f866160362694e/figitiretararisixugafob.pdf
    • http://midel.me/userfiles/file/vevaveredarutar.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/9ff7228af259f51c5fa4d87970c157cf/xakezajugupudow.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dac81d66c---8421351798.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4d019302564076b8afafcba678d3cb4b/25872148592.pdf
    • http://ritadas.in/userfiles/file/32490107166.pdf
    • https://immobiliaresancarlotrieste.it/file/65371002627.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd0f6f974---17775362707.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2749a4de---nalexa.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772b7484d49---sapafajatesakasofavup.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/tozirunidolan.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608586b5acf62---75902271308.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec8a3b3fe3---96304604278.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c5c90128af5b8b5e5087354a7eb67f74/10803709449.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021d20.bin
4e8ace62338aaf38224e92861eb2e0da750e1f8efbfb61ff57bf258ac10582c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x21D20 10248 bytes
font_01_sfnt_off000233d2.bin
435df5d5ccb8c53f2329d50fab695fb781e3eaf10e5aa938c49b2dcc6c95a3f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x233D2 19132 bytes
font_02_sfnt_off000253f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x253F1 16792 bytes
font_03_sfnt_off00026c03.bin
de480e3b17123a82df0b47b6e84efabb8dd4555569487d45846db06f8b6ee496
pdf-font-stream PDF embedded font (sfnt) at offset 0x26C03 20460 bytes