Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f305f08a2f59bf…

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 13:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5f5a8500e19953c0e7a80bf85493056b SHA-1: 12ba147dcd8994290a692beb31223bcd97f0a2c7 SHA-256: a8f305f08a2f59bffb7df9480dc5d80af7033f10e90459e2d36bfaf2e5dcdd33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vresponse.net/userfiles/file/tajekasivokasun.pdf In PDF document text
    • http://www.bash.cl/media/file/30358410028.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210911142932_506116834.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/dajuzegenisupox.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/10868330226.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/besokutoxonerubeva.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/81078177605.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f734d0d33f---japijigidanajetusolemu.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109122145538376.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/gipimoviritegoxanemuwu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s78ou01u0b2tiq9cvq2am1bgpm/vamedakeraberufakofo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/ropikutujejufevadi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/soxosawijigenisuxo.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/2462816725.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bumibevaxakalakafekub.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4e9f600c08c629dc0575fa423728e7ba/12999868591.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace75d1baf---68029126854.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/niwegimezanoxawisarodo.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/44672027365.pdfIn PDF document text
    • http://krupongs.com/images/file/tuzapu.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/dubaxadewoba.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/18879574749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tema+windows+xp+para+androidPDF 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_off0000b94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 10560 bytes
SHA-256: 8fc22d3e0e48e2677e13af21870cf08064cdfb026a882b9940548e5d03aeb572
font_02_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 15816 bytes
SHA-256: 1f00ebec033537d3acee6141e90acbb780776d8427a4df40d9d0cc0165b3f92f

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