Malicious PDF — malware analysis report

Static analysis result for SHA-256 c853b8d09f0b2a0a…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 17:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d294f389f0c0c10a08a585073a406622 SHA-1: 7ee839a0a13ac1d5bcf46398f199738c5b3efec0 SHA-256: c853b8d09f0b2a0ad9083be1c01c5b6bd4ecdd1917e3af48fbcb636e2221a9d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dacinsara.ro/fckfiles/file/xumofuxuvobi.pdf
    • http://primaria-ciocirlia.ro/media/file/daxuzesutute.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51033025f---90760624423.pdf
    • http://araonline.hu/uploads/file/45301771400.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4054l6eul8a9mu3rlmqoq4c5e5/60676021066.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27f48b1bc---9671998970.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350e9a35d7---rexurodotaf.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55417a038---wilufukubatewusivelip.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/9ka8nsq94rql7rgs2k46jmr6q6/90017465325.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pcvsekmjhtlrktnct6rcb1k8s1/jinamalulifibogupidefix.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3a6d28d4ea2f247d3af335e59a44b19f/8590455256.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84617304785.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88c43d630---ruseguzenugiwemat.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa655f12073---71910937250.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jau4mncqo5atfu5u0hite5llao/votijafirekebukave.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753eab43aba---nuwusunapilali.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4781200c---53673638477.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bed6a709431a1a9d836599e70f08b782/remekidirilixasapa.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/tovowugevup.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9fut99asmfcvvbtb2gqbe6k5bi/padigitanewamisa.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/98bldv35mjdgo6ngmgsecqcktq/3027871391.pdf
    • http://innotack.com/userfiles/files/relazalajawu.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3f9a27a766c5d3d69b0709ad5fca424e/14290827981.pdf
    • http://londonjip.com/userData/board/file/ruzadobiwe.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c77039f23---pivesetebaserobak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=branch+accounts+notes+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca4.bin
b03d22eb2cd9570c79c037a4372f9a361609a069c46c0cf5127907d0e4cbed92
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 16928 bytes
font_01_sfnt_off000118c4.bin
448b9d0d4b22e0b4136257a1dce919f3e59e924480674e4d9ff3b00229b6ad28
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 10732 bytes
font_02_sfnt_off00013168.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes