Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca9b1a86b83dec2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 12:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9d801c37f427175c18f468a3bd82d7a SHA-1: eb3147dd9e605e6b61e6e221cf3ca8899d8e3ac1 SHA-256: eca9b1a86b83dec29d6be44e761c8b9892b7230e407b71eaa4bd119c62cec646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to disposable hosting and compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=get+100+likes+on+instagram+free PDF link annotation
    • http://aihyang.com/userfiles/file/59007104328.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/4509882376.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/68750548274.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/27o9reln77qbdojnhh3qktv3d7/denixugu.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/92798749783.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/70875290697.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/rosejobumitutilovupuzubet.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xisodubebipezunomede.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/39086320680.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/zolavinozalegupokogevupir.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/nivujizena.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/50408035719.pdfIn PDF document text
    • http://mebco.ru/images/file/rojifasezofomizipomagudu.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902011432.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/bevudopu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kumebe.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/27486280191.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/jajul.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa6798af9---bipixaroluxogi.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908060605800464.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d8c06ec1---24307164050.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/71133442756.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/575158049.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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10864 bytes
SHA-256: f6b4e81284f29be61132f22859b0cac73d02d2515d9461dae23eac0806aca4bb
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 17944 bytes
SHA-256: a226a8ad95a58f2df3dc8306bf53a0d38bb5fb0708950b82440a53d36f0ea65b
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1