Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb14c428a4dd887d…

MALICIOUS

PDF

74.2 KB Created: 2021-04-28 03:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4864ed4f239489f6752ef36c72b2e4de SHA-1: d95d5f4ec87ac994eeaf2c4a87e9a6874e5348d8 SHA-256: fb14c428a4dd887d19b5cc95cb1714cd945f3627b49085bdf42c1ae799ae6606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/463ae8e1c6c6f8bd40b54afd8f4ce476/xatoferanosunaverafefaj.pdf In PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/46c9646d4ce12b84d9435ca6a5b67498/pebasegijizik.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/267586b558f660c8c57f7b5a394b3cb4/nadesisojasuxunawiw.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28i25dlvpdumn1sbu5gtff7823/wijutefefozefulijefefozib.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083babd7a652---25810502290.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/08fb97ab1e4d4d6b8f16cb18cef37921/6679426121.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075addeb6a72---47668341145.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c737e9167---pivuvutanopamu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd51986ed1---roxarole.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607318f84ad26---muzaxawidupuxopokagif.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/u481nbtchecs6h2qjg9o5ksoio/bubasafimimozobuv.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/e1vv18rkfaqrkbfb8q6ns0opt5/31547860809.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ef56df3c333ac0e207cbc46a060d883b/bodejaxunoxojojax.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da43ce32ed---78236343235.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/4920358401.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ec1b5a65---96606698091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=abcd+malayalam+movie+full+bgmPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 2952 bytes
SHA-256: 95d20003a5d1eabf6b01fdcb0789a00ec3dbf3a88d8f9cfb7f6903033e597c7c
font_01_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 5360 bytes
SHA-256: f141ba461cd0756fd5a4a13c306b8328172716687861ad74b8bc58e6db9aa70c
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10104 bytes
SHA-256: b1bea1f4962ca4b8bd8160d443db36740a253357a668e6bb73cb26e52df71283

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