Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0f17516d609746…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 02:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ae7db3034c9931f79c3d43feb3f25fc9 SHA-1: 70df0a03f26df000338199901c7bc042c5a014aa SHA-256: 8b0f17516d609746e48dc8673558774712665fe0a6866e9dbe33d1dd7152a2e7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on potentially compromised or disposable domains. This pattern is commonly used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://hospvetcentral.pt/site/upload/file/lepovanagupavabavewerofo.pdf In PDF document text
    • http://kasintorn.com/images/upload/files/godoxonotonulevesa.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1d5cb15c9da931da2139e27b6c1df0be/56588918994.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/82490111521.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1666ae107---dikazozirokubopenugogi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1672b5c---65977755089.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3tord1mhvecn0cef1b2bv096iv/5384329824.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107c7989e4---wutagajegukuvajerosoreged.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ef363b8f---51550426430.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a5e782ee487466c4ed4bf572c28418bc/gaxagob.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/4185308f7783b2cead2faa88c6110a7b/23890544977.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1l23rvp4u9lvf7adksta4imso4/91684190914.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vavagifuzujovuk.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/91269437939.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i9oksaj5b29vse75kce79125hv/bejaxoturotaxewiloraviz.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/6c271c5ba264f5acf1111028d9f8b93b/76292469619.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gomusar.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/89354871571.pdfIn PDF document text
    • http://clarasonic.com/upload/file/dusixixefikuru.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa56642371---16895067568.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j7udiffaiii5hn9cmkr0qc8mq7/dugez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=i+see+the+light+in+your+eyes+lyricsPDF 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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16856 bytes
SHA-256: 88177eebe42be89d6d4655c263fc877bcc0fd1ad861818cb5143c8eeae6f2830
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 10512 bytes
SHA-256: 35b25f80bb504ba1eb60730b389b883d8bd962afc7902eb275a8a73d136c7721
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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