Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbbf4e79c1f3088…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 15:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1d73605104f8e322f7cf428bd78f9c3 SHA-1: 4b648cf82e63fa3323b6287e64f871dfcaae5614 SHA-256: ddbbf4e79c1f308800c6a903277e5c8be723996160a39d91c9bdffc636d7536d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=indian+train+games+2019 PDF link annotation
    • http://explosivedevices.ru/media/file/xazofazezalisupiweva.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/35329319463.pdfIn PDF document text
    • http://boki.hu/editor_up/nuwemawemipitenibubiwimad.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/15299986007.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c2ea9c97f---sozadewifasiwijapuzej.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/sovatet.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e834f56---67916964201.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xomibixev.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/12275577317.pdfIn PDF document text
    • http://z500.si/files/fokikubikim.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/16688913890.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/25359301373.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf369a6d9---44461549749.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/88997911882.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rakeri.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/kejajerotumuzeta.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109091326099811.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/52497718263.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e4bad249587e248233e604c20a1ff8b5/gasanapuvogotepavam.pdfIn PDF document text
    • http://24cvety.ru/upload/files/38530200245.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/50835098295.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/redoxorafolo.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/vujeja.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8es08n0p8gpv7l838j2qa6si50/2283867688.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/090e340d921ef2da6c85a036c2a55adb/valusepesijelolu.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_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16788 bytes
SHA-256: daeccd62258d9fdc05f9bba0a807cd9095a84c036d7d78dfe02e69db88dad988
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10836 bytes
SHA-256: 25927d4981de9a08d981c0d74676c4d1563336b1f6754853f0cbf387a67b7ea9

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