Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f13d198bac4a52…

MALICIOUS

PDF

162.0 KB Created: 2021-06-30 03:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9261882e294623c8cf94e36343de01a4 SHA-1: 2c1072074d7a95638c2464855441b691163ee155 SHA-256: 93f13d198bac4a52cf8f34051984ef3325a10c7a9b08de7fb33019d1bbd410d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=general+characteristics+of+aschelminthes
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0dpbcge0q5d0ds9s2rg5m8ej47/wenofiroz.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/20d09229188f5585f70153e0ed56c6cb/31787442681.pdf
    • http://indago-rovigo.it/userfiles/files/vetun.pdf
    • http://firegallery.ru/img/upload/31111731542.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160765c024b8a5---57478311224.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/2f100c494c3cc839931fdd0cbc292453/gepipotesapogikikiwet.pdf
    • http://luchetti.it/userfiles/files/wulewaxigakefojinupubalan.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ba54cb11---15994154926.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/e37f4cp87ae6b9ir4g340e26a1/sumavoxabebawepuxo.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a256de75129---9521080520.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf2344aaba---voxuwerebizuvimapikepeja.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7612ae11---rebeteva.pdf
    • https://kingwrapcarspa.com/upload/files/nadujumigamidifevutarafix.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/nitowoxawi.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b990c223254---jijexabizet.pdf
    • http://osteriadelcampanile.com/userfiles/files/moxebelifanos.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n89s2or8t0sf8ljanhj13asob6/67069585989.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/givigazepaxanozezowito.pdf
    • http://riversedgefm.com/files/file/jalexitemuxepe.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/370b7af1fff232326bdabe95c0c7e13f/gokog.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/bukumarizufezumizav.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcef12c1cc---xenepodujusimasisexepe.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/771f3f9f7d927cd11d856971d5aff317/99153594985.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_off00021b35.bin
9647c5844f1a833360aec2452c0c2b28c2870b95e1dfd9d52a15109dac82e067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B35 10640 bytes
font_01_sfnt_off00023361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23361 16792 bytes
font_02_sfnt_off00024b73.bin
560a8bbbccc121f54a30658c72a908ead13dc80bd5ad8ab2004b1a1deb74c9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24B73 17876 bytes

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