Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d95fb5cf6a84a7…

MALICIOUS

PDF

86.2 KB Created: 2021-08-25 17:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d8b0b21d148903f7ffefcdbe37572b4 SHA-1: 51f6c3f4b1eb062760768ae491c07c688c8ebc98 SHA-256: b3d95fb5cf6a84a7cd520fd2f296cd496262a1ae907c179b73f4fa96377b0967
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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=basic+electrical+and+electronics+engineering+by+rk+rajput+pdf PDF link annotation
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/lodufizewin.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/37982835196.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/be3af3d8883a935b63f081ab868f7c79/podajewugazukejewevu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68731476754.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/q3kehmjm9qv3n64pk7qt0v2nad/rizotarututogag.pdfIn PDF document text
    • http://usmleworkout.com/files/file/madabobogizatu.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d75600111---dapinubovujabedopazaf.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/62328794238.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/df095a21b2e9d4823db21a26fd11437f/delixufedizez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071618913dbe---39802902381.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/75259770546.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/karupojul.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/latesivajamik.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765f303edd4---jarukevepuvogebunukis.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6466be8f42---garugijiteruripexepik.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e74bd30671a---pudapon.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/64413049766.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3522c69f7c050a414bc70280fc8b5a87/71865028331.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ec73c6abd4ef276833c9043632336e28/98151563889.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/50168def6b19e963d8bb6ac9f4cfcf59/mutegiton.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5f04e2f089a864d20488199c86acce2a/jovuvulonabewazot.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/punujitofedogilogit.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ae6642cc---megoka.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d946b07b6194133ab0504617db5e5766/28552262553.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/52207425452.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gajosinogasibanidezimoxa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 11424 bytes
SHA-256: 02fbafbe950609506c73b03382a01905bb4988f1d2f59d32898c012f07106682
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 17100 bytes
SHA-256: de63580cf16665a2b079e8584ae2a68f4238c2a894925e2b14013dc2a2f2126d
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1