Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a47284f017f7ba…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 12:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d35f5c76a66db7219fc9ede8c62a725c SHA-1: 4d08599adc3cffad4bcaf190551a174768813ae4 SHA-256: 33a47284f017f7ba692cc9b09bd8928cc0097651c9637fa67bc6128ce1b87eff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of external URIs and a link farm indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://twfindia.in/userfiles/files/nabojinadazoxosokarareni.pdf In PDF document text
    • http://csc0731.com/userfiles/file/20210912035904_mkppv2.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210904235855.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141a620e4cb2---lojerusijejanijenoja.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0d1680b1---lotidujokikix.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/64051067146.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/linifipofilu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c78a4f5b7962ad315be08cc48efb3f01/fuzixinaw.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/75852931923.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/60607776906.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef9aef6f6---31084482090.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/vefenofuwovakudilakib.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/xegamilif.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l5s6pmbt1l8aaffne9qo131cdl/49002595312.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/wutodefuvanewowirukibopuw.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/zuzepilonilesasemeravula.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/zoxagelebujofeteve.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/70733882714.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/j9e3vj5fdnmkuj2ba6kqj31i7q/lomafabiwudukon.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/ditorutazomorelida.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/2694871675.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/loxofexuvigoxovemakivuz.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/wesuxogizemum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=install+new+keyboard+androidPDF 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 17948 bytes
SHA-256: 12565e80f20e1ab6e5d9e3f6ef5252ae4842b9b55cceee0a2fa907f4a24be838
font_01_sfnt_off00010807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10807 10624 bytes
SHA-256: 82f5c0d48cc642fffe77155bbea57e2ef71845469f85b81c02cd5189a7154608
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1