Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b2e84f1396759c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 23:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06d6f482bee65a5b87cc05a6c7fc5e5f SHA-1: 732e98c7c24739191d7cf889995709bf33f521c0 SHA-256: 84b2e84f1396759c4f05b2b2f6a7b68bfeb6e1de166bafc3c957532e2b4c97fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=transportation+worksheets+for+grade+4+pdf PDF link annotation
    • http://mhs69indians.com/clients/864804/File/39705568060.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kixikipedomonos.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4735fbf90063f215e762d8b3d98c40fd/18883281236.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5129c1804---wixowitapoboke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61f27fbcc---13148245674.pdfIn PDF document text
    • https://argumentua.com/i/file/29689756030.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/kefugogegumobawos.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/88a72c262ed9d177c7083f65fdbf7f34/33844209897.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/uoutuvelab1p8umvussh6q4e8u/72508348921.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adebc0ce697---ruwetupukajaditideluf.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3tt0o7h08u0nl9huv3dnmgsg30/wavezidod.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/4369544943.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/90751484731.pdfIn PDF document text
    • http://babamoleskine.com/files/file/4746109163.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087771d612c3---60428412758.pdfIn PDF document text
    • http://skomi.ru/img/files/file/luridu.pdfIn PDF document text
    • https://allianztc.ro/files/file/jojovilukur.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/476188145971627865678.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9179c1e5c3---koluburupadafiraz.pdfIn PDF document text
    • http://htwy.com/upload/file/wakugozepemilabu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0700voal3p3th33m4jb62dnv10/96259430221.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/36905468115.pdfIn PDF document text
    • 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_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 17156 bytes
SHA-256: 232665a862bcea17733a7630613415dfdf8d6a2909f6cf7fc138f5259145ce5f
font_01_sfnt_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 10948 bytes
SHA-256: 2a67e8fc5fda1144ee84bc025e10a6a9247ebdd5b8b7bba92ab7ce2ce1ec6a93
font_02_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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