Malicious PDF — malware analysis report

Static analysis result for SHA-256 b484412e2f1d5c12…

MALICIOUS

PDF

149.2 KB Created: 2021-07-01 15:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 930261139bbe4d14dc650fac3fd8bbe9 SHA-1: 48647befa7db1ec53f3e9e6b3c60c6de5e0d51d3 SHA-256: b484412e2f1d5c123840f63ce3a23b57f596b57d55c5f86fe4fba14eb2950e56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or credential harvesting attack, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://allytemp.ru/uplcv?utm_term=complex+group+structure+consolidation+pdf PDF link annotation
    • https://cissud.it/uploads/ck_editor/files/89747621727.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/saranijogazixuwotakuw.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160973b606cf6c---12826505244.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db191d305---nipabejado.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f55c3314---42110460880.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/59254827038.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210530_6E2EFAFD3DD1BD81.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bce72d330e5161d5cdf94cedcfde61bb/40088707837.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4e2007da---bamibanu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085a72b33d89---30081897188.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e64poiqmrv0p4pper86ftma30d/65665096394.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/37927269044.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/32447352341.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/57023176701.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/18171811277.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40174294382.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048573c671---pewivodekakuv.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/45220054236.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nfeqkdj3doheh8frjcv842t7ps/81246962248.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/594t5h8i42jtquutda6c1aaft7/27770557285.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/52002307142.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mafur0q0kipk5sp8a2660n1t67/70490163519.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/e4aqsglama4duuqr58a962ijt6/94311984599.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF53 11196 bytes
SHA-256: 546150ada23dfdae746bd9f9dc8d7f730fc251915123a5397ec38e878b8d2f0f
font_01_sfnt_off0001e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E958 17976 bytes
SHA-256: 42192934ae01faada0eb46bb052f8a51f2fc78e3313309b0ffeec5c442286659
font_02_sfnt_off0002192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2192B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2313C 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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