Malicious PDF — malware analysis report

Static analysis result for SHA-256 afef111c2c1263b1…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 15:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56d517c096e134f54bb52a07271ce74a SHA-1: cfb7860b2833841db35b7dc79f66675a17b70a3c SHA-256: afef111c2c1263b14e82ee795c33594fcd045ff6c6b57af1e06909e5208c48cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful 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://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7ab9b96a2585f3868ba82143cda41a8b/44148393483.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e761b1668---moralexibo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7lftu7ilbbd25dnutv5gq44so0/45662698966.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/boxofi.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/41398672656.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052011093370554.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/57662100475.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//70942122604.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/54732455556.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/xutapojiseliwilobe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607832d23ce1a---95518337383.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/5197ff10e7f4c9db4beb24918d83ae79/liloxokat.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/45561086122.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/guxojuvunufenotajugobim.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/12025325378.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bujukuvilavuzevuki.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/99023488606.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968cb14f125.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c39fc2cc9e.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/53db80512fcb71b3750ff482d827f3e3/xowam.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jdgl9m6gvteeo0ikh2gh85nbt9/84231671551.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/68812419402.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/nivariwelixakujorunimimuv.pdfIn PDF document text
    • http://bjjiffy.com/upload/nalegimogiropavarutosise.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/napufiwoxobetuwik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=worksheet+in+excel+summaryPDF 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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 18508 bytes
SHA-256: 90c761c4066904a9a7430e0604c6fac6cbea0c11dec77cba2687ac0d4cb46bfb
font_01_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10896 bytes
SHA-256: 29d4cb8ba9ffef9eb77e2617d13a020b408784a215b6257180f17665350e5bb0
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1