Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7229c1d51b8c905…

MALICIOUS

PDF

91.2 KB Created: 2021-07-03 08:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6cee6948f5e40c026fa65780e09bc7b SHA-1: 90fe73dd457edfa773db1d18dfaa99bd1bb012c8 SHA-256: d7229c1d51b8c90537e4c0831017e9cf9bc9e19fc57dccd788f735fef2acf484
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm behavior are consistent with a phishing campaign aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5bcb3034---36055287232.pdf In PDF document text
    • http://bpsstudio.hu/uploads/bezenakujokaviru.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/41046808749.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/rirotipezowamozukuwesimo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa289c79f2---xumufokumowumuzavum.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091dff811fc9---tanujunezezolo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fba541b3261b48f64087ff68973c6614/nisekusevorerovigoju.pdfIn PDF document text
    • https://alutat.com/data/file/kajawiko.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/25380308599.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb1bd76df---dozekifogixizowuvozobital.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c9c78718---nalepobuwapuku.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608613169022f---24174191376.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/577c436913155b19d0a4001812251747/46511056138.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037c119d9a---54583072559.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tiketubobitegeke.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/xawujibajebuwexaduxex.pdfIn PDF document text
    • http://artside.org/data/temp/file/3115492683.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/kedapox.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ipi9hjhl5afsiovefrkpf0rff3/japonurovej.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22743025698.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608272576185d---684872576.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/hqnbv7nh0s28hfrq9269q6j3u6/12914925089.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f0550f78---85131965981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=exercise+for+weight+lossPDF 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_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 16948 bytes
SHA-256: eb2113c084754742e06cdd990288cb962b2470ddf8b77754eae4512bcae15b38
font_01_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 10520 bytes
SHA-256: 05f3712f71dd3c19c8d7c92c19887f40dce071bee1e2ca5904625473a382ea39
font_02_sfnt_off000147a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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