Malicious PDF — malware analysis report

Static analysis result for SHA-256 688935ea039582a8…

MALICIOUS

PDF

74.2 KB Created: 2021-08-10 16:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74520c6560fee3ddc6aa96151403f3bc SHA-1: 70d5e960ab7ca42c441161bb135bbdab4e497c90 SHA-256: 688935ea039582a80d71253f4300d8467fa6233eeae90ec92311560a8f2355ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories. These links likely serve as a lure to redirect users to malicious sites for phishing or further payload delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0m8ldj26q0forsk1rr3o7k4v2h/zovatufo.pdf In PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tenorelimivozumakunamupof.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xawotarovewef.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/sebozuvulesatesasur.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6e99d6e7a2a0aaea2e6f837affcff88b/16164891217.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/2137435498.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3318368c---sigib.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zojivukazidovewidiful.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa502bb2423---guruzagusosatulibo.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/34827215715.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/17481973154.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/43309555475.pdfIn PDF document text
    • https://ekransamara.ru/files/37893001846.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771a58bcc94---boradepomamajiwewa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8apirfi9s9cn9maai47n90dlf1/zoxobemuxaxuno.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ddbc85e6ab8b218f857aaf8ea0276391/vebarekamusonifus.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5010779621.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d403747502---newomidibonojaforilakamed.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ea78317df7802dce983f9113fa2e1b9d/zovirekeded.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/sagolovutelug.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/26906870201.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/menoriperovalizuzuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cuadernillo+fichas+de+las+vocales+para+imprimir+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_off0000b7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 19276 bytes
SHA-256: 787026a009b46283f45c1af59b59937dcd7dc82f15348587f6f7d0549977586e
font_01_sfnt_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 10984 bytes
SHA-256: f39371a601690c1918a0df20d969231d542083960bb5fd0d56aa0c5969612de9

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