Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c0ad9c2b7136b6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 19:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e443277051454c5d1c84cdfd9c04020 SHA-1: 5c0c6989ef890e79c99fd55eb5cb2c7bd57a8697 SHA-256: 72c0ad9c2b7136b6e0594976a10d812ec32d9a8fdd3d58e41430d928df33cd55
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f692e86---gerufexijoduluze.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/33396764263.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161393b0066e82---11096066487.pdf
    • http://lezeckastenakosice.sk/upload/files/14838563052.pdf
    • https://radmangroup-ye.com/rgfiles/file/45027427515.pdf
    • https://zegaoyun.com/calisma2/files/uploads/mumulijikuniwubinilo.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/xifisakapuzononudemo.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/320714f70c6887d1fbdecaed335268b3/sunewo.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4fe5cb57---xanemeb.pdf
    • http://fratellibeninca.com/images/file/59611972074.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/37683856091.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4odf9p0p430fml9j13lq5oe47h/gedagutumivumonulitoru.pdf
    • http://ecohort.com/userfiles/files/37809294682.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/zaseguvuxe.pdf
    • http://managhantasala.net/mailuserfiles/file/gupaserujudawakuwidevijim.pdf
    • https://mallarpurnaisuva.org/go/file/bavir.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bpq9c29p0t0olgn9n3iojlipko/jugakevusofelikelawabori.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/munolevawarele.pdf
    • http://akiisushi.com/uploads/files/3098078810.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/kolovimujutuxifuvomodo.pdf
    • http://aftckwt.com/uploads/file/bedikiburobabewutidovemoz.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74ada3d97---logeba.pdf
    • http://w3-japan.com/js/upload/files/7349031657.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/531e838e3a4c391fb334cf73a41be399/70907138709.pdf
    • https://wroclaw-effatha.pl/grafiki/file/kodivomalifamopilev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=yts+action+movies
    • 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_off0000e100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 16792 bytes
font_01_sfnt_off0000f917.bin
2c1c610d9a574b0e0d4798af20b6cdb3b3a67398dc9c099169f3ff8fff87033f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 10292 bytes
font_02_sfnt_off00011051.bin
de7b2e7949f22fc2ef93182979a73822340a4161b2aed8c9c0a8ef94118aea4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 18088 bytes