Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea9a0eef3c9968…

MALICIOUS

PDF

91.1 KB Created: 2021-07-13 06:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fabb9ece95179fd424f1a93b023f2afa SHA-1: 05aa90e076c4355902757df9a5243014c6216b91 SHA-256: 4cea9a0eef3c9968f641a78481619059579e5675f6f9efca67997db094e8a257
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or redirection scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://christopherspubandgrille.com/userfiles/files/84501862686.pdf In PDF document text
    • http://bucketdiaries.com/uploads/files/36096275535.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ae8d64639rpq187r4d6fmd4r9t/giziputewunowexukoretu.pdfIn PDF document text
    • https://xistenze.com/files/files/xejubekas.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cji62a51d91mh2khapjuv70bm7/gunupokejowu.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/72422954653.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/fevazekaxedel.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/tejebovitiwozozatoze.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/dixilitujudokitemoz.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/vikaxabimitawanev.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zijoboxujeluguneb.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1784539a99bacab1a50cab503f5dcde1/92754887511.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7e142825---xaxazadekinoza.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e437688710---jolabudavutifupa.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/77044747681.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/i1t78ek6ttptobe78sf6varp2e/40619895563.pdfIn PDF document text
    • https://avvocatoboretti.com/file/19826417715.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/59869685075.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/nadinujotudividejawixamu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30bd80a1e---zubowixoxukol.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021556524515.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a58ed0c5---difepudemazajobifepisa.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5285d68bb---55920550541.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608817bd373f2---17634333870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rock+and+roll+rock+musicPDF 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_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 18036 bytes
SHA-256: ab2d76d06351c59c9c5df4621edb246d989476e2f1958064d0b9b4c4b5739136
font_01_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F5 10536 bytes
SHA-256: 9cb4bf84dc1d0a69e1969d70f95c6e8c72c7552d32984fc69fc14adeb5a1bf54