Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b4e0b99f450639…

MALICIOUS

PDF

81.6 KB Created: 2021-07-16 07:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 772889bab8615f1e867dbba4fdda3831 SHA-1: c272aecd188e63b9b94aeb0ef1bfc43371a405af SHA-256: 43b4e0b99f450639ae939c254b8ee1bd454741b88d9e87e4cc44be0212c7bdd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=world+space+station PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/118c639dff7ce1d52983e1a85b58a9f9/25329137056.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/bugomusitomixidago.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/48259369036.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/fidusixeninajuvu.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/rekupevexabosakukirefosa.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/vusenakisekoloso.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/pamimabiwoxaniba.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210531123732820831348.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/jaxapi.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/wuwikebikefufuw.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/zibafakimiwewezategug.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6afa50145---38539311605.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8456aec14---bimapuxezoradobav.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e3d94e725d7b9ab4b84437954a14cbf4/58035943471.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a059bd85fe4---32940596381.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607231f68c160---63114009439.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kh632uj6lhb7braklpqesu5o58/54892591225.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/e0qr1k6ea6b18ijhrdsvguvjqd/81702321919.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7116247c459629765f8a3cf4b388f81d/nomuzalatuzeviwanuv.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/vadukejukifavebupu.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/nodufunenujirovexabonif.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9505e9281---6906370903.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/pidulopa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3c4a9im0h31gf4nmam0bm81ns5/90266715922.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lg5fhn8rk658srgt5ek2ks8uk2/damurugobibavijisatoso.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16720 bytes
SHA-256: 58f52b442250dc0aec0d4db0fc941338adbc235abd449173c5ddab536806a559
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 10500 bytes
SHA-256: 2313afbbd9b1bced44116efda26111f9217dab9653e44d8372aae04e0f52e481