Malicious PDF — malware analysis report

Static analysis result for SHA-256 2562c50e150bc328…

MALICIOUS

PDF

137.4 KB Created: 2021-07-06 12:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c23deb562397bf62b20267c25b560cc2 SHA-1: 88961649ba4e9d2639495f47a1156439ea41a537 SHA-256: 2562c50e150bc328106eab071ee6296e4a15ab0cdb394e6832f1be5fdca26d5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination. While no scripts were extracted, the presence of embedded URLs and the link farm structure suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mbbs.hr/files/basagirogedele.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0rpdm47lfu8tfodnuuodmt5cj2/95352342998.pdfIn PDF document text
    • http://ktcz.eu/files/files/17427623974.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/092fb49a8c12eb59856a992bd1e016f1/91237054468.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/90506666178.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f19763dae---94890517585.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0cc625c6d---xoruzowalorinasopujo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/88972d45c8285b3599240a02e267ec00/49690546517.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/12290042905.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/20281724361.pdfIn PDF document text
    • http://abnicum.com/files/file/mipefap.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0lsgennmdjq8d7ac11delm876/9247624910.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609484f65cb97---gofuvasitukagutug.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mexoninofononedojejale.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/67407811252.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cb5ea4dc4---20748244217.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/367190dfdbd69f54a6fe669d509b438f/najawenir.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c93edd81209---50007935834.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d8c37ebe---negojuxefixomis.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4253a46d5---27460119905.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/20976999676.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705406745b2---mikubaletidasobagem.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tedaxuwonami.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/75536680198.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/76126362763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aipmt+prelims+2010+physics+solutionsPDF 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_off0001b8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D10D 10968 bytes
SHA-256: ee453d84f2a183af686dc15e98fc5221dc90aa902c30eaca13c8cc00e8249a89
font_02_sfnt_off0001ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA74 17336 bytes
SHA-256: 6c3681378c5af73f49a48622b0a53dd519ce92b967bac9c5e7d0e14ee2aa953a

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