Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1ea6d24522bc5e…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 10:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8a61a0599e7b9185e316bab3e817373 SHA-1: 8a652ad0c667e014c8ae6eda65f8d85bbd32523f SHA-256: 2a1ea6d24522bc5e2083b8bb2b717f53e6f97c053dd2b3c885b182bc34d3d28e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=on+the+jellicoe+road+pdf+2shared PDF link annotation
    • http://gidaero.com/upload/fckeditor/file/mezoxojep.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/45803158283.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/74436167078.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/11782477667.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d7s20ct6tcpgf1jhkkpvlhan3m/46856549877.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/51b4a5c259fdd7e26f9fd5429dea59d8/fegepewukogoma.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/867957475.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/lazumamo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f50b7ac7a---84746652350.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/gokagapakerivitis.pdfIn PDF document text
    • http://c-amc.com/upload/files/78872212963.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vo2un4bucsuqqlv1g6v9vgmbaj/68787464278.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/698665f2a0f4c5e4bf8e1a02be97d006/rulaleromuk.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/10549714830.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/21989223232.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/2541251760.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86242733244.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/34921877100.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d09c20d9---kuvosuzalotaw.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8029d5a6af30b315cb06df6f6fa6e0f3/jasepiwu.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/diziwuliduw.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/puvir.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd631183fb1e4eb0b4bd7c7d5cc2d44a/65521047351.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_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 18156 bytes
SHA-256: 5a22639cdfaa5697964ddc3030715414876ecde482df4e47f94ca81ba715033a
font_01_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 10992 bytes
SHA-256: f348cf9bdd4c8c31fb1ea6cde9af281dd2785cc4867d64be7879fef055ed85b7
font_02_sfnt_off00013ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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