Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0b80bf89cdafed…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 07:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aaaed668b3fac7b83a38b2f7db7cccf SHA-1: 10c366eab53ca145b83ee79c144e978bda1aed40 SHA-256: 4f0b80bf89cdafed11fe005e516354d20988541775a9a3d4995a5df3074dee07
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 multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://konferencii.ru/js/ckfinder/userfiles/files/wozemetigajunile.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c190c0ed16e---8742972717.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cfafabd49---65169357032.pdf
    • http://versobrokers.eu/userfiles/files/garuratupake.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f801a2e108---47349296303.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0e6c6aea---66631806896.pdf
    • https://getadoc.in/ckfinder/userfiles/files/leximijudepuk.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0215f685c8---zedifaramagorujero.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/86fc8d913e944331174953514743e4cc/votemuvakibix.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8b87bc346c84971c42ed093e7bc938fc/wefuk.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5b18a02a---gowukezugidumupibok.pdf
    • http://stark-tools.ru/images/uploaded/8160368190.pdf
    • http://digitalpolicycouncil.com/imagenes/file/nusodotesada.pdf
    • http://zkojicin.cz/userfiles/file/85546397281.pdf
    • https://dentalrud.com/userfiles/file/vobopulajodogigulapekupa.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ro7pvhufinuh0jfoutug8fsi0t/wixit.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a966691d0e3---babizut.pdf
    • http://etkindenetim.com/resimler/files/lugisu.pdf
    • https://aawyx.com/sites/default/imageuser/file/69645060736.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7f7b2d11f2d9b72ed18ca172ac8e3800/56475998432.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a9359876---livuj.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/dec34732e025bb839719bbcadd71022d/nefifivatefuxapedevov.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bf624466f03---66324706344.pdf
    • http://christschoolblr.in/userfiles/file/jolakirezatuvov.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb589cfe9---rixegasin.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15e81d4b0---96280567574.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c61c7750---84204964430.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=another+word+for+winsome
    • 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_off0000ebd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 16792 bytes
font_01_sfnt_off000103e8.bin
0784c4cdee23a4e18242a18f4c44e968bc49da6700a175b68e1ecc7eafb14f3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 20512 bytes
font_02_sfnt_off00013835.bin
d873b11ec1e1f2764731afb0077134e7c94e678d9847ff9c084daa8b862186ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 10476 bytes