Malicious PDF — malware analysis report

Static analysis result for SHA-256 88aeaa8e7a318ad5…

MALICIOUS

PDF

92.5 KB Created: 2021-08-01 00:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0ca6875ff21cd3e68a056cf2c76971f9 SHA-1: 863d30472de634defbf3016bab12f3e4e750d78b SHA-256: 88aeaa8e7a318ad5238bd8c8bacf9f1239de624512c045e0218e88687ae9afbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs pointing to compromised websites, likely intended to lure users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=controle+circuit+electrique+5eme+pdf PDF link annotation
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c18cf819453---26766682338.pdfIn PDF document text
    • https://eternalbliss.net/file/derov.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4aff8441d3ae062f8df497ed7c8534af/fewoluma.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a004409ce---tovokowononexileteremora.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e2d0098bf---52331014619.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/lepubuzemikekavuwalixi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbbe97a81---zixewixoronunigitalata.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/3454658892.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f061b49a69e9b2b99111fa2e4679738e/60476897777.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4639ccd31335b8a82d0f03ebd4880270/wawolimemoxudus.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/30b92ede1ab5c2843baf27dffc2ac72e/wufovetijinurejulinalofi.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/40079726824.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210730_7C095A7CE64B5045.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/litubagebikezud.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6207e6f1---gotez.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/gupejezizebenuvemedazev.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/48000727461.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8570f8569a09f0584871567e95ecd6b5/6375352224.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094dcbf5b7d6---45537357023.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b834557392---75666404998.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b2a6275b---bofosepe.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/juwuxakepa.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/rivimukolegi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/73733394939.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_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 10864 bytes
SHA-256: 1e3dd0b8e2b133cfc3e931d2f6b99e04128766e4eaabbe28c79d8a0287a9b265
font_02_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 20084 bytes
SHA-256: a98ee46d1e21902b71f39204301743d00e54bcdb2040abe79e029e8c5b962ce9

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