Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33c9c12b853ec3b…

MALICIOUS

PDF

90.3 KB Created: 2021-08-01 08:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ceb739cfd8831d9c57d865db42740749 SHA-1: 9ea44b514129d5c769dba6d58570bb42b947690f SHA-256: d33c9c12b853ec3ba2264f4c441d7eb468b672bb68cb4957d3cf27a9ec495559
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains no readable text, further supporting its role as a malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da506bdb5---64873140715.pdf In PDF document text
    • http://fruitvita.com/files/files/vajejumiregaxowajawo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46937b2633---kaseduda.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/92202093052.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2cf67f2ee817e9a21dba36f6554af112/lutijafazi.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/19411906025.pdfIn PDF document text
    • http://ashioke.com/images/library/File/18048916373.pdfIn PDF document text
    • https://soechi.net/userfiles/file/87815060638.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab271652d---41469481630.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/43ad0f0779f8810fe5c1cbdd9db341a3/bokugekodof.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/14178638241.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/kimuxifoxavoluja.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7976c39159---85718129769.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ralilexexu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/4m3d6k23317c1a8ooc3931mtoi/dakoxupitopupugedid.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/2140934568.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/wiremego.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c6fd514c---fakijut.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/wexuwatexa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100141758fad---jenabebowuwal.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/22790490180.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/81133083552.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5b4ac882---95287684031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=frases+hermosas+de+buenos+dias+para+mi+princesaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10852 bytes
SHA-256: c36330cf0d29401b0895b43acbabddd65998fd5794c3953668663a36f8a2b234
font_02_sfnt_off000115f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F3 17296 bytes
SHA-256: 4c7393022912bf8153d0950ea2c79447d6db0a431f588d7f0a4af1ec56775ae7
font_03_sfnt_off000141e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 16480 bytes
SHA-256: f1d940b2ab9ff85f2deab49caadc5a5e7f7d916b0a1016972d86ee187bb175e9

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