Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb6f02ce4885fe…

MALICIOUS

PDF

78.3 KB Created: 2021-07-08 00:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2cfc089ea60d81dfb32063d03289139e SHA-1: 2374c7ef0f50ce4b0d8d5aafff732c26f15c4a51 SHA-256: bfcb6f02ce4885fe7092f494b61524c5eebe73157be74f6629ef254ce919341d
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF file contains embedded JavaScript and external URIs, indicating it is designed to download and execute a second-stage payload. The heuristic 'SE_SECURITY_BYPASS' suggests the document attempts to trick the user into disabling their security software, a common tactic for malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+download+command+and+conquer+red+alert+2+yuri%27s+revenge PDF link annotation
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160943c3b841ca---tukupowotevafa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7d7286cdedf3aaa9d0fbd85a44e3bbd0/lorozolapusisivo.pdfIn PDF document text
    • http://sparkpro.lv/content/file/rusajosev.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0b59af6e2187b739588531ed95be2c36/44503295253.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/43708894101.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cd905c6fb---tarokadoz.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hrv5qfkn163ejmfd3ohhor43lm/68519772185.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/xoxerigewevib.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/fikeber.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0202dc4aa1---29653400893.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/70982794f2c6e2fe7f2cb86bc4489a8f/54698970721.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d1c15d7acdfc0a53f35658c85182f0c4/towinidatamikosinifakibi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/xozezatomobokipakodemeb.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11122cd01---benaxe.pdfIn PDF document text
    • http://aven.su/userfiles/file/43912152197.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210629163732.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/buxibebapoxazuveg.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jijuzixogekame.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/dufolujubazaneloxaruwofa.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f73b5f8---54062469502.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af20567c3a7---68171295435.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/50905617933.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/b4fea85384a5aed66b73842d1d92f65f/89968984173.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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 18344 bytes
SHA-256: 27d1d60da2b50a94443158e925b519633137e29d5cc8d515d41d8a92704ec6e8
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 11356 bytes
SHA-256: 2aca5cb70747ed0efad7c24cad81348e68fbdee680326c27eb63acc948d5f61f

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