Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cef8ad55f4c7b6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 13:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a766fb0b41489edfad2e9925d30fde3 SHA-1: 35d9bfd4b7081fa4a13b8773dc80ceffc5895e27 SHA-256: 68cef8ad55f4c7b6162e8ef2998bb36eb4a9caee521a7c8ab22e3d5cae557433
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution lure. The presence of 'utm_term' parameters in some URLs indicates tracking, common in phishing campaigns. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=titan+shadow+fight+2+hack PDF link annotation
    • http://werder-ritter.de/UserFiles/File/kebap.pdfIn PDF document text
    • http://raczcsalad.hu/files/14463148584.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52529161731.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/11880520576.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/73536847792.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/wixalidafiresux.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ccf95d830---4946027155.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/gupijuvinotepum.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/66939119627.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/39685566188.pdfIn macro / runtime command snippet
    • https://fiberglasssupplydepot.com/userfiles/files/4252283584.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/48726768274.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/56140353707.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f98094b13---17223048384.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3de7cac7---dewut.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nujodadekiralafubijib.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/vaxigugepovududukalitirad.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/ledimufaxelogewit.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/lagat.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6138b9aa89574.pdfIn PDF document text
    • https://autoskola-scp.com/files/91791480455.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/maxobazi.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/zatozowogepivebobipole.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/15067097085.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/rabupapuderewilurax.pdfIn PDF document text
    • https://almuhja.netIn macro / runtime command snippet
    • 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_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 10736 bytes
SHA-256: 9a0a442079c7ea9d4b18762666ee07da80e47e1ddb288ad1e23afe4bbf168e43
font_01_sfnt_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 17512 bytes
SHA-256: 56353a717633af3e6be5857640e9c7be59cb281b5e421d12723c2034ad99ee5a
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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