Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dde0fe25171e28a…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 00:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: af5b02f9907c657135db6e96bcbbd4d4 SHA-1: 6e531e644e575cba6c26bde5367d65da96373184 SHA-256: 2dde0fe25171e28af8a9c701a7beebb9ebdff773b3a549f6add1115ccb262b82
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the PDF structure itself is weaponized to host these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/93630628049.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083daf88de53---69742030991.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f31abb55d---dogif.pdfPDF link annotation
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ef7e40ca---libabigibuxunuxisofuxekan.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd3623cad---57580841522.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503221029108.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2fc7119a0aadfb3a09b518f6c55467c1/dibinijoxelulolisamu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f516601baa---fobupuxodiwejuvowa.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd15d6595---golinuzejulu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2deb6e84d---tojuviminenuvujosunoz.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ic0jdnj83d7ovbva3s514821ta/lifafedidivuvenefaxexo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840697e61a5---volunedopizezekezi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/95d0ea9a8002c71156daa89c332ec2a6/20114187085.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b66d49d727e18ce2db4a914d496d70a4/57485585373.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/saduvidujalo.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/sakuke.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/7708034341.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160882788b807b---71683235234.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ki2quou42vc89dgp4po21d1081/zokap.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/tokuda.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/46821187758.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/46548828660.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/kebusoderak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sister+outsider+audre+lorde+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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10560 bytes
SHA-256: 11563821b6c5bf0975802a493dfca6a7db6c92aaaec9a12258f5bdcdc25aeb6f
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 17136 bytes
SHA-256: 904d4e20a70cdebcae4381e08de14ad233c033db7293f44d57135fff9f78d2a2
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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