Malicious PDF — malware analysis report

Static analysis result for SHA-256 5947983ac519fdda…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 14:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68825ef26a5adc7b914fe0d98ff39d89 SHA-1: edecdd94420ca2196d5fc85c64c1140500040ca2 SHA-256: 5947983ac519fdda79731fae6bd0bb2bf57e61bd0e05c04a1ea8d27d085a73ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan distribution. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to download further malicious payloads. The presence of 'LOLBin token sequence in document text' suggests an attempt to disguise malicious commands or URLs within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pixomot.ru/uplcv?utm_term=ace+academy+mechanical+engineering+study+material+pdf PDF link annotation
    • http://gdfsztal.com/uploadfile/files/sojatijukox.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493bdfb6dce---51350509266.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/91619292000.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/42362372488.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/20044756393.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/43523725338.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/96243371413.pdfIn PDF document text
    • http://fnathservices.com/upload/file/midunumosufalog.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81396026257.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210924235534.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3eccbf6da---89421057839.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/momimimare.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/vigajipejosid.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/41581909345.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/23016198183.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/paraxikepevulox.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/38252112916.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/314e055d1feec8e95075a58a88428a06/burasebonutivazonibe.pdfIn PDF document text
    • http://riph.pl/userfiles/file/zipideniwuwabuzixigim.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/97663026127.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/retekupufagirikawedus.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/36314148397.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/55097941546.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c3d49493aba8bd8773a14a12d99e7bea/13934844956.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/88438156782.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/jilenubikolafitulaw.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_off0000b183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB183 14716 bytes
SHA-256: 768ac92ffedf5282b0d3699fe705dc2af4007003a43441e12ac8c72caf07ecac
font_01_sfnt_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 11144 bytes
SHA-256: cf1a94ce8719ed02f49959412cd63bdafa87742af801fccebe145aef5ac17931
font_02_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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