Malicious PDF — malware analysis report

Static analysis result for SHA-256 8305553b6c7911a2…

MALICIOUS

PDF

81.7 KB Created: 2021-08-31 20:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04a0dbdf81c54e2c999a9f6b2e61ab3b SHA-1: 86717856c4dae79b409ca8c1ae91f8a1615ab7c1 SHA-256: 8305553b6c7911a2f31a37b52ef9b2a36062ce148d3de70a20a38a3dc74d792a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution by luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://scantech3d.com/files/40649403500.pdf In PDF document text
    • http://coopmong.com/ckupload/files/kudoxitunuzi.pdfIn PDF document text
    • https://marosme.ro/hirek/file/rebuniwebetoxibonapez.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/8e161bc5c858dfe3c83589578ba26032/narinizuxoxotoleres.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b71a0e058---10005105030.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/2896132503.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c066b4a8f91495a63dc9c196558813e1/vudisalabevevogepowabu.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/jofejutilasopowi.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/pudidalemove.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///53742474302.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba713a337---70097366849.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/97300807612.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9616d5db1af14ffaf02e352889d016f6/magas.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/39416402399.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/58702877249.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/mosufikafowimavoted.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95152ddf86---vesozusipoji.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de1db9393---sarodabulusajademusamuvi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgr6pl1l1mvj9r3ln569nr4rgp/tizijujenofusenotufuju.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606e632468de2---gobobiropubuziwus.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/58847183189.pdfIn PDF document text
    • http://omg.su/upload/File/75507233260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=write+your+own+story+onlinePDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 10232 bytes
SHA-256: b4acf4dc99eeab05bf2547ac70a69182664219aeeb45b5927a287aaad9688f93
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 17824 bytes
SHA-256: b8923eea1d7021239c07a5faf60b4051ba7e413e2d5d0de3ef425add53d3a52a

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