Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb45941dabdeebf…

MALICIOUS

PDF

97.7 KB Created: 2021-07-31 15:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 14bdb675e3d0229e5d37ed5fbbebd7cc SHA-1: 9aa509ddee0c6a1e4b63bc0ab6e6a0dc642f4489 SHA-256: 7cb45941dabdeebf79d0abded10417b3af4303f760b480b5649e3b6dbf985518
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and IP addresses, suggesting it is used as a lure to redirect users to malicious content. The PDF structure and embedded URIs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c8a79dad93ed8de18b0975d7cfca314e/duwebozati.pdf In PDF document text
    • https://blogsma.com/files/zugejekovoxarifili.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac414aaca67---getelazazelam.pdfIn PDF document text
    • https://afayl.com/userfiles/file/12194572151.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/890725dc26d6aad96000dd8e0d48d0d8/fedoxitubupopubodokin.pdfIn PDF document text
    • http://beymersan.org/upload/files/87908579523.pdfIn PDF document text
    • https://asken.as/bilder/file/96484257910.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087593bbe478---19857481192.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729ea259e7e---sosonazuxuxukepe.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/fimivexofixoj.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cd1bfc06094858343687e13f1266961f/28233392795.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/zigiz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbec5c803c---lipimamibunuvexi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/0ecbe6148bfc2374ad5dd93c3d1cc2f6/77385498226.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8476b497---7979780406.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/makokapidosefejesufef.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/af167d6fb88bebc2694affa8c010463b/zafuvevumorode.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff414b8f2a0---tewum.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1804343a---kuxulomivujugekep.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/89678104199.pdfIn PDF document text
    • http://land89.com/ckupload/files/wikekivatuvo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/koribigigoz.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c75e06b6---rajavawe.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=teenage+goal+setting+worksheets+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6ff3b6effb5db0d8e60de33c3c0dec93/lajunomum.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_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 17404 bytes
SHA-256: 685024e87bb535d60814a75d2973de54716d2cb173afe2c2e5be77a12ff4ced8
font_01_sfnt_off0001472f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F46 10916 bytes
SHA-256: ed8a7f0f8ea2c4b1e9e3cff907efa19611512009100874a6023b870d0693782c

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