Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e948cb5f78e8dd5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 07:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b6baa298984bb9ac06d2905113818ba SHA-1: 3fcad4e8d1385d314e899622af122854ce78dbb6 SHA-256: 8e948cb5f78e8dd55b72a031543e402654d8b261f2362e1067c5de7369a31883
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crewmak.ru/uplcv?utm_term=delphi+spin+off PDF link annotation
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/37851437b8b542ead142366d41713eb0/83905349491.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xegotezadewilexowabafeg.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc61bc7fe3---59227082151.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/taderava.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2ccd02caaa1997eefaad927e11216322/mepekaluripusut.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/83fb0070090f69fdd63bcc9dfc35048e/72100602278.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/tepuz.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xuredonixukisofumutewasu.pdfIn PDF document text
    • https://avenue102.com/uploads/file/nalazijuvemo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed96522c99---posux.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iv0ghrj3roc6ukldh7v8h00b5/badedomaluzexumuja.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/h2715pvujvisrqr5okgde6eg2a/47250692705.pdfIn PDF document text
    • https://maria-galland.ru/files/file/josivo.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210708_863E793790962633.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/54688067952.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabbb234ba---9914972973.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf94d4e71---sevarerifarexaxun.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611410693d07d---96127789107.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/joxine.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/67044835477.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/molav.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01899e686---kevuwetizelipulo.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_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 10096 bytes
SHA-256: c495720dd03049192740adb4b5d24214c58e15e6ae1a03e83eee56ff1c5805df
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 17388 bytes
SHA-256: 4aff44cb451238cea9398a1bf972fc668ff9631cca0fd0dd4f7df0c405ff3086
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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