Malicious PDF — malware analysis report

Static analysis result for SHA-256 0332021e13673cfc…

MALICIOUS

PDF

67.9 KB Created: 2021-09-14 05:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a2eba8d433e818049fd7ae76698655e SHA-1: cb3e7e67f9aa3c46f6b84ac316f477758197f8dd SHA-256: 0332021e13673cfc14b7c475d0233069d98caf381e7da9ef7cec6735c2a6cc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varodofibofukumapiwugogof.pdf In PDF document text
    • http://sanmorales.es/userfiles/files/dudufekumolapuzapevew.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906065412.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394d111af0---liniruvuvaras.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/jizexedazu.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/17167858327.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/zipatosowoxotigagaj.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bccf83b2b---9826363156.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210911_045629.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/goletujerezepewa.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/72973947754.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94a7d4232---bozabasuwow.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea8854cc9---vuxujulupiwejafanes.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c05bb21c5---58478696069.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091015251773499.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/48571133167.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/19152020244.pdfIn PDF document text
    • http://www.depomatrial.com/file/83641751009.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/firokeroneduri.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/dejamabumijixixusiro.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/33779293112.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/womibozuxavanupigomag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=my+orange+be+apkPDF 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_off0000ad71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC588 10360 bytes
SHA-256: 940d18617bd39bd9385c4574665a802d19152ea80d6fc3e5f181cb8aac5beb03
font_02_sfnt_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 14848 bytes
SHA-256: 1bc2a4f18526e4e04217dd4604ecc297859e3d5a8fe3912ab87a1dcc14b0104f

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