Malicious PDF — malware analysis report

Static analysis result for SHA-256 604493f41ff6ac6d…

MALICIOUS

PDF

95.8 KB Created: 2021-08-02 19:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9ebb099e76ba9e27e7f6349364fab101 SHA-1: 887b36a350f3a19ddddf1725bf62bc0fd47c7c3e SHA-256: 604493f41ff6ac6ddb8a3e7155ed1528944e61316289bc9394b060e020c7ccef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://be-now.pl/userfiles/file/bijogol.pdf In PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/865f34d29ff9f893f33ea42117652c41/37796205535.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fexeko.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/58fed400aff84178365c04cc8827542a/74255763072.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/nasarefa.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/buwotojipobazevotidut.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/vudawibefuvibujekijegemon.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/tegivavojijaxirelodinam.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6e394e8e19e44f6dcee05225b5bced90/98009771896.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc667e3eae---42575557015.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/54492238660.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/69033962820.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160db53ee1561f---8896551130.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088c1f80ea3a---41616448232.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcun8iamr8sobdqd7ub9bpk3kb/47908256321.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/gefinonemuzanim.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/85999855408.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b2975491---89054699079.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a264823aa---58644457947.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/23d7b8c86c83422024d76f9c3456abf8/titikatoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+happens+in+a+breath+of+snow+and+ashesPDF link annotation
    • 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_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 17064 bytes
SHA-256: c39a08925b2f610cb37bd6869d218c3cd8fa432c31f92a2ce1eb4143ba48d8cb
font_01_sfnt_off000140b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B0 10768 bytes
SHA-256: 8b2d468cd575ddcabe970bdcdd0f48afd590c166e3547735854dd9e38e352b2d
font_02_sfnt_off00015946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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