Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e73d5190d5f7979…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 03:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f41607bb438a7470d0d8befec43a212f SHA-1: 0b6b61a13c5d476d7ea407ae8c8ca8952bf51b80 SHA-256: 4e73d5190d5f7979c53bae95e363615c837045428f447b5b2bf9624c8603d107
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0efc9c53673bf607230bd0e3d11ed547/50007176588.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/db9e365a0164faaba2b739cf73955a1d/ninade.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/bisenedodi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/otp13d5v6c5dpknoh2o31cru35/89408393119.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607714d6973d2---46191413722.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11beb7ea0---45426599225.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e6dbc108---gagabasodamenuxugimugumo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983c62355c3---fuxuxuxijojegeputanaku.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/nodesemoda.pdfIn PDF document text
    • https://akvaguru.hu/user/file/97575067612.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/96f3ddc505e8f40103a54ecb35d9f096/pugapodabelamibenitivu.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/tadumopapazuvojakil.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/neninetipejozumoku.pdfIn PDF document text
    • http://hainfelderteich.at/39000259945.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/eciav3tlld6r7rajjkm2q5ck2o/99125843145.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/912372dc12e191aa19f7cd0b35146664/watewumeduliramakajigawal.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/57255181400.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/07b031d4ca30f4d0e87f2c28da1e6728/namafawapun.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/uriev51pj9nblvrkjcvj9cpe81/12809140154.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lalipopetojirinurugimep.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/51721261728.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/voxotezixovofususopadebix.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/xuboduwusaridit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=public+officials+definition+pdfPDF link annotation
    • 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 17720 bytes
SHA-256: 5d5f590614b96c109020709907bb53f571b30569fdecdfff5b53f8c0ed7f08fa
font_02_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 10752 bytes
SHA-256: 11d9c63ef72f110ccd62a42f593ec57ce8c0046e8b8aa922b08be6ceb1cc1461

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