Malicious PDF — malware analysis report

Static analysis result for SHA-256 0019b11ac5a34855…

MALICIOUS

PDF

91.1 KB Created: 2021-07-26 23:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e21cd0eba284729791a4dd2a8e9060f SHA-1: 4174cf78b1bfa3223728d0890190554e93e109c7 SHA-256: 0019b11ac5a348554d2dd47cbc478569c23df2dcb3de8e137f0f2bccff07adb7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the structure and URL patterns suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://marosme.ro/hirek/file/15469560630.pdf In PDF document text
    • http://reicar.dk/userfiles/file/rudagamijibibozaxolom.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c220cfce---8503457306.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jivikatapenalufid.pdfIn PDF document text
    • http://firegallery.ru/img/upload/96971869282.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/fumavuw.pdfIn PDF document text
    • http://iccarrentals.com/files/file/67546328752.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/gololibuso.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5605bd605---63076237884.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7388675883---41815798706.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/79402874548.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/teberexosutinulimegufego.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607496413b904---loniravodezux.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/15a4efd46d6b9026c2778ed76919e33c/buvipogoj.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f364e07b1e3---zujaz.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/186d3297f4c63bab3314070c6ccef1c7/83882909378.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1cf8db387d1d3cc8fde3b822e6d2489b/97040142279.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afea90c34f6---serogow.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2ee101f63d38112f407d659a9f9c2fd3/21184266382.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/facb216a6f29c6ead64fe33590b09d0d/23273391450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=english+in+use+3+eso+photocopiablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 9036 bytes
SHA-256: 3f30313d6b69c6009a59ac801e528448c3117aafc13732dd0118d77f50969ae6
font_02_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 10948 bytes
SHA-256: b2477352723fd88c1894c84f829bd94c3de9c64127cda42ea119909713a26c9d
font_03_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 18236 bytes
SHA-256: 20e6594938fec34d9b4a3bfd9c8e9595156202a5f6dab3a5bab10956c9fceebf

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