Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6be5e8a7e77dc9…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 11:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a33f55e4369e9f9cb5c9d11f59cbe882 SHA-1: 9188cd24077e8233831f826d2d530ba35eed6dca SHA-256: 1d6be5e8a7e77dc9e209ea1ca609898f082ab7394c927d7a9d72f61938f67673
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cnpair.com/userfiles/file/15954242487.pdf
    • http://metallpress.ru/files/tumaniru.pdf
    • https://aramlasmerok.hu/uploads/file/nipirutewul.pdf
    • http://re-media.ru/foto/ck/files/pufofegezovifulumidake.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/2146872770.pdf
    • https://zaindu.drogomedia.com/files/galeria/files/94357072959.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/41273933666.pdf
    • https://aedwea.com/upload/foto/48962826317.pdf
    • http://anduong-nhatthanh.com/uploads/news_file/vovumekaga.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/lazadupufinu.pdf
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rugesolabajapo.pdf
    • https://xn--lenachatka-57b.pl/uploaded/file/foxobanovukozagepof.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/944af4b625d84ca1c94c27c3a86f8945/82303092970.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/kujenawibezelek.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nibiberigegelakitajujidal.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/wunubiwa.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e9186c3b---64442138740.pdf
    • http://uelzecht.lu/userfiles/files/gumakede.pdf
    • https://dalba.net/other_files/File/sibezoxo.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ab8a69870c3be73ab6179c83e2aa303b/64963487422.pdf
    • http://jaluzipro.ru/public/userfiles/file/46343933727.pdf
    • http://mgrima.com/files/file/27867175942.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/627a3c2754095039c14142c87d0de2f5/72107500766.pdf
    • https://sunnyrosesschool.com/userfiles/file/natavax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=snapchat+android+vs+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece3.bin
948471244c6eefbc2ca29c9f819776e15819eb540a5da94a25b5aac4555b59f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10708 bytes
font_01_sfnt_off00010570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 16792 bytes
font_02_sfnt_off00011d82.bin
2f3f3ce5c8a06bbc1ab730a020d29573379fb518dd2a36aab35a77f4cda8a536
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 18348 bytes