Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fbb8d96b674d6e…

MALICIOUS

PDF

89.7 KB Created: 2021-08-04 05:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6dea4573d9bbd52a98d05d82be2b9b6f SHA-1: ba76d02af26d444cb59e0d61db4c1d126235bbf3 SHA-256: c0fbb8d96b674d6e86e8bae756fa7c607ae293bd2d3be4d96fe5b5d02353816e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://topas.lt/userfiles/file/57400747165.pdf In PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160704093cc8bb---33444120560.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cd845c64c---nopolusakimenufivotafi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b2ac34df27aeb21b30e6c4cec1e24bbf/kuwaviwatexodobo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/37f809f1f57457c420791b5b7e70cddf/47355924601.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/78384766361.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/66174553522.pdfIn PDF document text
    • https://12shio1.com/contents//files/xavadepogatezisuvimakinuz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608272d1ef64d---88763777592.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc3db7f45---1822605881.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/91473542434.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c1387db9---vivuxuzidekutileji.pdfIn PDF document text
    • http://ruihuitax.com/files/file/buwotubedukipiwijusuref.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892ae90b0dc---mugazuxexopa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/92230567700.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/27885506712.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30955f35f---jufarupetubidosefe.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/4427416813.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rulepimatus.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f18d3f41cb9---farojutotabelefi.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/wewanimoripizigazuj.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/56655434036.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/61181724764.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/rufiduwijasox.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ccd791d2caa5c7e3e0fcfb573439143/xigigomifodolejitig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+song+achyutam+keshavam+krishna+damodaramPDF 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_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 11276 bytes
SHA-256: da63078a93ee12b0ae20f15c578644f3801451ca487ba777d4a2a0476620d7b8
font_01_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 16844 bytes
SHA-256: 0e5af0cecb587e7bfc345c680ca2fb7ba9234ac3e1f75191cc807d4ee2a8f1bf
font_02_sfnt_off00013fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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