Malicious PDF — malware analysis report

Static analysis result for SHA-256 36068616b8f4b1bf…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 16:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b57a06549591963b358cc0205cb8ba5e SHA-1: 1dcdfc01dbfe5ee435a77c0a106eff39eefe2c57 SHA-256: 36068616b8f4b1bfa930b45fd6ce98cc64b033c4bba3df283fe8297cadfbe8a6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. This suggests a phishing or SEO poisoning attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://pakianco.ir/data/image/uploads/news/files/duwaledirebimesizubo.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/28899646960.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/85234251937.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5mjrah7n4ijdsu7s9stssb0ftt/peperejetevolemisegi.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e658215f1e1760c5e26d4a9874b3ff5e/81402113132.pdf
    • http://wang023spa.com/userfiles/202109file/2021090721022070554.pdf
    • https://ottenburger.com/userfiles/file/20863165232.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9eoe4duj1n65413iqf32abp9m3/dafogunaganu.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099a27cdff8c---kilitiromamixa.pdf
    • https://brahmagnanam.org/fck_uploads/file/tufafoxunexonuturup.pdf
    • https://sentinels.ro/userfiles/file/15177369347.pdf
    • http://jedwines.com/cmsCart//upload/file/novejaworid.pdf
    • https://contabil-fiscal.ro/mm/file/fijutuzugabuzuzilejerom.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada501e1e7---27794494497.pdf
    • https://aarhuskortet.dk/images/file/13252279791.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1675e2a0e---71944136657.pdf
    • http://premsaktidal.in/userfiles/file/45092685024.pdf
    • http://garnizone.com/userfiles/file/46091710276.pdf
    • http://timeyear-v.com/userfiles/file/21775771618.pdf
    • https://alshaabcoop.com/userfiles/file/64499349480.pdf
    • https://mytopics.it/uploads/file/67983877923.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25439688a---guzekidupif.pdf
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/66850055799.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb1406441---3746947298.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g0dciuioeibn4jlsu05qq7knq5/19128287935.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=icecream+pdf+editor+descargar
    • 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_off0000d4da.bin
9dab34d2a7220c01ff31c83f51e2aea9f76a062489cbc2ffb86a31e8443e0eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 17504 bytes
font_01_sfnt_off000101bc.bin
bd5f99c8e92b2229d9b40225ceec7faab0fe731f23f31128b67743c9bfcf2bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 10764 bytes
font_02_sfnt_off00011a55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 16792 bytes