Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bc40ae7b57d808…

MALICIOUS

PDF

85.1 KB Created: 2021-07-16 04:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d124468cc6b2c54d76799227b9a2093 SHA-1: b216403faf3d87bd61b66b5a17688a01d1164e48 SHA-256: 88bc40ae7b57d808dcf350ad3c67305fcf9ec6581ff68b3fff2560ad2f085500
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute malware or phishing content. The primary URL, 'https://coretry.ru/uplcv?utm_term=gta+san+andreas+android+lite+download', appears to be a lure for downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=gta+san+andreas+android+lite+download
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098749910e66---95954051821.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b269ee46a4---64188860748.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/488ef5cd8a1347e9f7a5950f9be56d4b/85022038444.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3524b1f9ab3631e7a170e791cce74661/xuvozigoses.pdf
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/74665402460.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d8141781d3f82630cb01c9a0d1835e66/xibub.pdf
    • http://buergerforum-tirol.at/file/jidofu.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078d1a2b5c---17151700715.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608927dfb3be3---kezuvid.pdf
    • http://randalljroutson.com/clients/44711/File/58056345150.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6e8c157e---furawerufubipu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/39a410fd621ea70a9c7d437000ebd107/29752464567.pdf
    • http://rajskiewakacje.pl/userfiles/file/5874812382.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fdfe259e7---24810328743.pdf
    • http://brlairport.com/images/file/rozuwotogaxunanedus.pdf
    • http://siripanyalamphun.com/user_img/files/50649417449.pdf
    • http://biosurfest.com/userfiles/files/zajuvo.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/gawobipelemalufigopijebe.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4d0dab109ba63b9132653af2048801d0/gogef.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wejuroposamafivu.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lokinegemet.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b041b1ae8e8---18374221846.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/811b59c12fefe3e1a1f8fb24a678d366/43715398782.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/071f34fd01241e9c41c0ba14160dbc54/zufiwefalaxezi.pdf
    • http://joyearland.com/ckfinder/userfiles/files/fovaparuniniserarixeli.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_off0000eb19.bin
a0dea7ef6aec3ac77877ffeee96dd6e798f5f254c1b7111b2bfb277802e92066
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 10368 bytes
font_01_sfnt_off000102b7.bin
a3e8961edbe2b9fa3cb49980697349b2db156fcc1d3decfd551724c6277227f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16960 bytes
font_02_sfnt_off00012ed8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 16792 bytes