Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f0b24bdcddaa88…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 21:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd5e2a2fff7aea3a41cfc2811cad2b58 SHA-1: 3605b6614f775d477931352787631521e17393cf SHA-256: 41f0b24bdcddaa88c6d9aa15324b585a6b49901c7721f97ae496ab0415dce98b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The PDF's structure and the presence of these links suggest it is designed to redirect users to potentially malicious or phishing content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=complex+analysis+elias+m.+stein+pdf PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2201660315---wemegawi.pdfIn PDF document text
    • http://maisondequartierdespareuses.com/userfiles/file/tuzapawalusozidep.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c4f0e7f6e4ef52e0fbaca125b75ea60a/tewowi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e80bb2196---wasujudawivixis.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/63590176441.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/xowep.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/931a5e6b3aaabc7c209141e656e9b618/tijos.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/tonizo.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/koflgeu8dg0rksa8navi45rft1/vofizoraf.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87521254191.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/8851536130.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/82884719578.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/witofasuzebuwolokoxub.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16274301221653627085.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b1d86bf1---86080482779.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/semiganu.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210601164259338.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/62205830594.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c864845a7a7---japanovigipojorakit.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5ed5a063aa0804d6e2b584f69a7ae295/vosipoxagodidojunow.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/72868326115.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d00e17250---91437616263.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/vuminezobedaz.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_off0000bd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 16792 bytes
SHA-256: 355b9255dcb4f5e3eff312457f6623216cc8dbb9a8aa7341bc0f745dd372f3d0
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 10872 bytes
SHA-256: 32fa94d92c40d69fd623b10c3615d768d884c0c195d265fc111c300152e03778
font_02_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.