Malicious PDF — malware analysis report

Static analysis result for SHA-256 3097802d5bf139bb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 02:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f8914fb66bf857f9938293d6dce31cde SHA-1: 3bb2038fe5ef5c8e817668fc1d4beb7253f9be0c SHA-256: 3097802d5bf139bbd07a021533ccbc23ed76f2716167dc5d4d10da568519d9d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://asesorgubernamental.com/images/file/jarufutob.pdf In PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojim.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kuwarepat.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/77226165348.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wabivasepuxebek.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/jasuvofimefuzufoli.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609826aa9eefa---67064995210.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/50686766805.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/83953520746.pdfIn PDF document text
    • http://hrudolf.com/userfiles/pejaredazasude.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/91b660d5cc25a2791e879a201929830e/4836890373.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zelisudogiwanise.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/10146050947.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fe6d5f86ddfb751bb44d3d74bffec0aa/majapoxamixifumibubolom.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/64395418568.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1vi295t5svheuq5paolqds9p1o/nutigimibup.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hpqn4oaq7skp0r1h2in8q9rr80/44816854134.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/kobawojakalalal.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b214dd5e59---52428814787.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/puniluv.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/35858378384.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lejuboziro.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/79337479261.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3bf5c113a09bf0394410e1be4e2a60c6/51096839965.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/40920084605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ordenamiento+juridico+espa%C3%B1ol+pdfPDF 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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 11244 bytes
SHA-256: 6d8d787456783f0545723ace0bec928ffa32605c59bcc795b3405c9192ec1ca3
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 17360 bytes
SHA-256: eb8696644aa9ca12c258fc5be1a9c209d512f15a6316196c0a560d86127f49ac
font_02_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1