Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4db457208b5b644…

MALICIOUS

PDF

92.9 KB Created: 2021-07-05 20:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f3727f2a1cf554b90314c6b2df3b5da4 SHA-1: f18334c03208d2ff3bce410314f833cb1944956e SHA-256: f4db457208b5b6447315b91491c6a84c24e6a7cabd42e53fec3359296a744ac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://coretry.ru/uplcv?utm_term=meaning+of+plite PDF link annotation
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ef165cadf8c1369f98a8139acc530de3/forezijuzujud.pdfIn PDF document text
    • http://186086.com/upload/files/nuzevoloroja.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/22914138890.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/seduwimivepikizididatiwi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607374049e18b---zulikoxukototu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2apiiekaislke655v9abhvvpn4/varapofemaxivaviwirom.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/85838248943.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/duzujeweruxazatiwi.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/80025523375.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/bujalaxaxawej.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9d95ef9436a8f8011d5128706603601/zitigabogexetasifir.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/47949373848.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/27337612915.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d7a9944cce9---wodenojavusinewanirelus.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d42133a10c2d2283fcb782942f55e1bb/90374101754.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/amm2rrvlb6nvmorfcupfnaq949/57536282906.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3e37af54---nabiwizata.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/63504228629.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/81298042970.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/kowugosebajesogibubuv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7fae6e4a---lukovoxuzepakep.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9evq7srcb3mvicuqmqqabv2pv0/4390084705.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/mesatefizosaxidekeve.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/f97fdeb5cdc5b32673bc1dcbd2914e6b/55577132693.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe9ddbe4d2---46284575732.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/69840594009.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_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 17148 bytes
SHA-256: 149e26f19d3ed65562c8b830c3d849a49951fd8cf57abad0654f1d0ea3e0244b
font_01_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 10256 bytes
SHA-256: 19744fd36fc84aedbe696d5cb5c6aec5f3b1ea23ef4109541602587d28a1761f
font_02_sfnt_off00014cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1