Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a611e19526be363…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 20:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bd53f654582bd99176e293bd4ed233c SHA-1: dbb9ef15dd792e93ced627cdb33c6c5eb8d74cd6 SHA-256: 4a611e19526be36342cd79df764e259bc0497fe32f04269d0503581890a7e22b
96 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the URL structure suggests a link farm designed to redirect users to potentially malicious content. The file's purpose appears to be to lure users into clicking these links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 https://oniceh.ru/uplcv?utm_term=wrong+turn+6+full+hd+movie+download
    • http://irollee.com/userfiles/file/39595119293.pdf
    • http://cutencuddlybreedables.com/_images/file/katufajixenuxituteditate.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0c3258ad99aed8818063903377065873/26889356360.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/261lk9akrrb6h4pq8nlgbrh39o/73014159053.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/3dckmloepi78fklms5p1lo6fh8/82342811382.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/564a5764d33b0035717070f6c3b3bd99/35741903205.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/17b15264c4bd8e77cb2f0c65d3355546/kezuribugezotafutasabo.pdf
    • http://eventechsite.com/files/files/memap.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/460p87jmdhghm2gc4khnu0g9cv/23149789698.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160928ccf13ca3---dawam.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586a88e69b---322543386.pdf
    • http://www.bluewhaleline.com/image/upload/File/xoxiforalixopelosak.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec29cb91b---zafoganudovabiwudedomo.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607271223abfe---87737270877.pdf
    • http://selfmadefilms.nl/userfiles/files/10657617052.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/eb2a4c007f08e219fe371d67b3447e04/kurogivituto.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/52f5483f6c878c6194a3c294cbe6dcb8/sejibukugemotolorevut.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/badf378688b6ee90808783ba41452408/mopasafalanosakuzexol.pdf
    • http://besttailor.info/ckfinder/userfiles/files/vivivaweroxu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/624daa624d7291d00e1d92258c7b7a78/89858396777.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0ab42835---nedizo.pdf
    • https://ludifrance.fr/userfiles/file/76350757863.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/93e4fbd25a95d0724adbeed345fdc3f9/26076723697.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c130c0ca---26402067500.pdf
    • 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_off0000eed7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
font_01_sfnt_off000106e9.bin
2eb76405b35f784d3779cc5789602c8312bbde5cb8d97b2a9c92f2d3ae717b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 17084 bytes
font_02_sfnt_off000133c2.bin
373880135508fdc0ceed9117279e50b178bf797dff423181e89d49f3e1c74b57
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C2 11048 bytes