Malicious PDF — malware analysis report

Static analysis result for SHA-256 152ce93685ed02f6…

MALICIOUS

PDF

93.4 KB Created: 2021-09-05 07:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fab6f4fc0a696704bfab03c9ff18f78 SHA-1: 7b6d8023feb111119f10b5581ac33d1669d03fb8 SHA-256: 152ce93685ed02f64430b6c18da02bb930e132470e5d6cc21aba0651a25f28d3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://novichiha.ru/pic/file/15777999746.pdf In PDF document text
    • http://hani-bee.com/userfiles/files/34418496341.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62bd9343d3---siwixubonedidipiro.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c950fb23b71fc1b93471dac90a3f7a8/11016444919.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9gm9honadpr76qtvtjreop4tpc/pivegiberojexobonowif.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/55778252666.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612097c62578a---puxetidif.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caa49d746c6---ditigasoburixofu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zujopil.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/69c86f31f5571436fb372a257bca73e1/serovilagonebu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b778babfa3f---xaxavisimewa.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/63773481898.pdfIn PDF document text
    • http://okvin.org/userfiles/file/74193320567.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/11b3c98b047e21bfa63d69ae3f346a25/4537802666.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/87800788085.pdfIn PDF document text
    • http://accronline.com/userfiles/file/35588257736.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/32m9luib5ou0urmkhf9pbdv6q4/sujawobidiwi.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/48940417480.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dakomufugajimoximo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095943d3be82---48013015770.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/zenizijinuxikunixiwita.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee6a48d70---13541767870.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f9629a96e38---9287221542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=questionnaire+sample+in+research+pdfPDF link annotation
    • 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_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 11044 bytes
SHA-256: bc6ac6b1078e82cabe3f2452c39c90220eb311b1123f9eb3354b0ba43764d447
font_01_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 18768 bytes
SHA-256: b5adaa51271c962f3b4cbc5d0ae2c6315c6b064f632a46989001f0a44238fe47
font_02_sfnt_off00014fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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