Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d1c5deba324686…

MALICIOUS

PDF

83.2 KB Created: 2021-07-28 10:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12ec2445a94f2c3f35a23a5d80713894 SHA-1: e376eb2ceece70e5b30c96d94547d5bbe0c309d5 SHA-256: 63d1c5deba324686bf0361a35b4046a5f5cc1c9ddb48e899b6573a40ebcc5df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac027b6e0---37987580738.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e3149999---bamarominafetuseliden.pdfIn PDF document text
    • https://ccskin.com/geektic/files/jepamonefaju.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/seforapetuxomuduxusosaj.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/91761557050.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/77473055657.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d86c2bc0---83749011262.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a310107bc40---rolobobodukubiwunuvuja.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5090dd2ac20c0a7485ec57d420417460/19693201178.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceb9e9b9d---67155438249.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f0itjtp5vq8uhirt6ikq2ne5or/nitisutinira.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/89285c1549781a2de3384b616b847d01/53084821701.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/2528143818.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083496fda2e3---10368937267.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/xuwawubagoxuzitatomavog.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/59145803743.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a94ecd617---metoj.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vku3ent0kqo7vuuja0fm4q6rml/95615689524.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/40337684396.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/juvika.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895df2eaff---xaxizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quotation+marks+worksheets+3rd+grade+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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 11408 bytes
SHA-256: 4f48cc07c695b061b62676af252768fcb0fe5704b4fbb4335db2859283a47852
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16428 bytes
SHA-256: 5e1f00f835faf1f5a2c942ee17c1950b081f956fb5d39f1131c0c6e7e7a070e2

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