Malicious PDF — malware analysis report

Static analysis result for SHA-256 c811c9e38952c6e3…

MALICIOUS

PDF

80.9 KB Created: 2021-08-27 21:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39281eedb433015cf1651d53b2c4c8c4 SHA-1: c6fe1f72f67aa339a4480358075425d67023b14a SHA-256: c811c9e38952c6e364ee04e988bec0d540865a729c151877866a9ba8a32edb07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=unlimited+robux+roblox+apk PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0f3c1ba0c271ea0edc2763697646ee25/nirazupeselig.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0f10c661---77092064890.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/giwiwulenebosapar.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/89d379e1bf986dfff30f5c77e8274eb6/48009571754.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adfeb14732c---86810225184.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/4492106652.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/69004987295.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee38bcbd8d---76122168727.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d7781cdc42e548131b7786ff7b0758fd/43549141378.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086db305254c---10561766611.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/pujakodila.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/xukiveviwatibo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8746ad5a36---fusidinikefetob.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/volejujupilimubemava.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100f7458a08b---32431751933.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/tuvapoloxofovoxutuniviwi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be08943ac6d---40500745781.pdfIn PDF document text
    • https://digireg.es/upload/sotukufufivuvubekana.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/78372541093.pdfIn PDF document text
    • http://belst.by/upload/file/mivuzopujolubuxoko.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d10ac45493ed3c266a3801bbac62c0d5/83987435635.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uagh9h4jmp3ghgh2gcm0di4aec/nelarusetid.pdfIn PDF document text
    • http://museeducuir.org/upload/files/11519337002.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cea1850f6848e5f87ef8941620fe9222/tobava.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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 10828 bytes
SHA-256: 04f2428603a899c53586e6fb76140778ef5ef1f68cfc38af62d1e2a85ef18a81
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 18100 bytes
SHA-256: c2f97182e357051f9bd014700f2bc773d1928d4d9eda1575980f24bb470c86aa
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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