Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd82f99bbdc6632e…

MALICIOUS

PDF

74.5 KB Created: 2021-08-05 08:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8106dac00971758367da71d4f2475a2 SHA-1: 9d6dbe3e3a06f39f6968ca425e304916c2914f02 SHA-256: bd82f99bbdc6632eeb83e880e202ec3987b217a8989f0a9dd524f174dc8bdedc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure itself suggests it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=sajna+je+sambhal+gaya+mp3+song+download+video PDF link annotation
    • https://impresa-valli.it/file/kuwil.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0f9c785a---43827483890.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/89250534359.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/92079022572.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/gazivijexeni.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161092febe1875---lovibowudotonibif.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/25b3c71a2d3b416ca7b63bf0522b989a/20008144406.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9ff1f755196d3d01c3c74b096f996cb4/7580268051.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/84ftaf863dk1r6ehfn5k4dd408/91704375549.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/oosuhlopkhn28os2j4i7o1057q/22202329257.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bijefugipejuxide.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/19666181316.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9d9f875e4b06262e86a516f2756ab1b4/wabovubisap.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/88092748340.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/teborajajonemumolorefozaw.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/mavumopajuvedejex.pdfIn PDF document text
    • http://tele-video.ru/upload/files/kikaterevokumu.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/34392441395.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/33205539795.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kuporutiraxuk.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/petevazam.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fisemixememamoborizuxozeg.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081407858f0e---16832327090.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/saxilurila.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zevewuvo.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_off0000bfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 15804 bytes
SHA-256: 9db45e9621eabfdebcbc61897a2f9ef412a5d16c2b9a2cac235029c61fcd28a6
font_02_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 11424 bytes
SHA-256: 9a314eb135bb29dd12db2f53c66b73b6a563f698744fbb402c98ea8f49212f43