Malicious PDF — malware analysis report

Static analysis result for SHA-256 7099282f57e6dd75…

MALICIOUS

PDF

68.1 KB Created: 2021-05-06 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26254522845c82d30079973c11dd7390 SHA-1: 050475c5a16a8cd0abea3cba5b30d6338fea99ec SHA-256: 7099282f57e6dd758004580689a26d64b1abf9d7c7dc37aab7f571f0554ffc71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures or malware distribution.

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e257f3076---komawutekefogonupanapini.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365c1482fe---nililutijamur.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lspisagh2luo5gvm3lvv1a16ag/xenaji.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/wajisid.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ju0l4m2a074dpvueaht96kqg5/753623979.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec3f4ec8c---numasenototuduwamul.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/30d960022606803e0c73da8794ad9951/32593340674.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6473e5c95---73542562418.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b35c178476689b7e3d13c75f12636ed3/87345385471.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fad8spm46b0i49cjpllj1gu62r/72511684441.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8ffdd3c9---80124783021.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/f0a9a6e22bcb07f95b273439941e49b3/95167007467.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/76cee134682082f96305b07ca7c63ccf/xifewulixebu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/73fef0a7d4363de60dd05eead8af42c8/40987739554.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/35594021678.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/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=zombie+catcher+mod+apk+latest+versionPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 5536 bytes
SHA-256: f026059a7a2b1980af2f0181dd3dd55b2fe114bc86c769fde4fe99451f068e2d
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10432 bytes
SHA-256: 912b4ca891a245e85a6dd1eeeea7a127e0891d330baf13b5d4e746e52549a035