Malicious PDF — malware analysis report

Static analysis result for SHA-256 5591278a01adc23a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 10:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a912ae3e313bcce3ec33c4b61c2f5bd9 SHA-1: 89a9f74a39eb9af36a78769b69e1f678b5ad7bd6 SHA-256: 5591278a01adc23a795cb3e1118c21df9de78d3cc825f6e96a68cd4afdffe0b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The primary purpose appears to be redirecting users to potentially malicious external sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=survival+co+op+android PDF link annotation
    • https://himalayanthailand.com/image/upload/File/wumomapowibixu.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/zaxoxikamimadugofifatekik.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/62900282357.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/26562369134.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5a2d3b06676a4625a3319ce76df7b021/13225344412.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/lobigazazifalidaxopatumi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/9673250440.pdfIn PDF document text
    • https://tekmaker.com/upload/files/38209174281.pdfIn PDF document text
    • https://onlinendttraining.com/files/vegalesipibazewara.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/jugamudilinewebo.pdfIn PDF document text
    • https://flomogroup.com/upload/files/xifuzigenubaguwu.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/70110863375.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/vivezukiridefosunijemiko.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c55eacf1cb---sejoweletowan.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/30874210691.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351666e5cc2---16817559570.pdfIn PDF document text
    • https://chptravel.ir/data/file/8275561314.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/popuwetimosajomanopupeges.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/95601769283.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/90254947033.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/vagefogudetevufunixuxovaz.pdfIn PDF document text
    • https://reniuved.it/file/99285418438.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/pumuxabezezewukifitipimen.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/53863993456.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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 10352 bytes
SHA-256: fad1e19ecc9b2795e72c0798678e9ca5429984ec7419d8a806584ea7bbef95f8
font_02_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 17260 bytes
SHA-256: 7f325719cbcca9f8939ad2dc041629840136fa4815680b43e9f6467857f1664f

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