Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d7ffd97ccea40b…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f5b229fa51b5b403e833718179952c4 SHA-1: 58d05a0ca8c2e70cebb6badd3597481968ed7667 SHA-256: 22d7ffd97ccea40b2c7e19ee8caffd6e4f82d0661e17a0a52e32438ade874ed6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bed0f70a38c5b34c66efccfcd27d5f37/44896614875.pdf
    • http://honda-vo.com/upload/file/8148091478.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc92190bd3---nonusolowajurinexidafoxub.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a32d0af60e---zovaf.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d8d332b360e53defa478134b7d6134bd/92293187530.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v4nbp28l80r4h01fe392d71c6s/1874978912.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900a475f5f0---wufojogubumubevava.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/57062e9e2a10e24dc9eb4ccc2ebcbbac/28554560686.pdf
    • http://ahkjt.com/upfile/file/8503123358.pdf
    • http://qkmedica.com/uploads/userfiles/file/22150106893.pdf
    • http://haozuowenwang.com/imagefiles/file/dogusudanumaranoletanim.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1olaf5hr1te8ia8r7r6mpk2jrm/3897497244.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/xukuralazebemodokolofom.pdf
    • https://weddingitaly.jp/images/file/bifiwiwawuzofisaguwumowi.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9897c0827---nomotad.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a580387b2a8---633966743.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e36ecd38---94191000227.pdf
    • http://babywagen24.de/userfiles/file/26081110482.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc0923cae---12486169778.pdf
    • http://citescolairedeledit.com/include/file/91041619195.pdf
    • http://royalwedding.jp/images/blog//file/45895453253.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/fepakemitapasepan.pdf
    • http://www.huntsvillepr.com/files/files/nudugeroko.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b63c8086f---62766907880.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chromatic+harmonica+lessons+for+beginners
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd6.bin
b8f4838a23534c0acd502256d519055ce19cad23ec8698994fdbd642863a931b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 17624 bytes
font_01_sfnt_off000119db.bin
304564e247be45153110232e2413f842b08d7d162dbe4f9e20a2799c03bd4cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 10956 bytes
font_02_sfnt_off00013325.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 16792 bytes