Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d3f6b4f6b33938…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 16:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b72b609f1ebae09d27bc575e4488c72 SHA-1: 4a0af6471dfca5c3e15331f2e8b201a8f5dda5fc SHA-256: 26d3f6b4f6b339380daf69a56c43a853f587c3393200d35e7016a4023b5543dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chcial.ru/uplcv?utm_term=sap2000+v21+manual PDF link annotation
    • http://ouhkpthaa.org/userfiles/38787729493.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/suwenokeluroped.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/22211665274.pdfIn PDF document text
    • https://artenika.pl/fck/file/47206996323.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/29462789225.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/94079969593.pdfIn PDF document text
    • https://teddybestore.it/file/1864569377.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc88adb76---dupabolusesexumej.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/15464267654.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/1399982071.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeeb85adc8---fijipogur.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26403336266.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/39850728857.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pke1k39qsbgj634nm20pglqdkp/zawesepiwawisevu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/70mi44d26aer1ie83v075hcaof/duwijomasofawow.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/29f3c2f12f127cb6dad3dfdb0f5557da/27820437720.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160efdf2e491d2---lutexilorisumi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/46085780447.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bojav.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/74992042637.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/desesajigu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mlt242bhs42ohaqt8pkdf6lggk/19033065190.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7033a8f10---37569395021.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7ba262530781b7a81c1664bd5e615fba/jomokasiburuzerib.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog//file/zivixi.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_off0000b92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 16448 bytes
SHA-256: 4da568b1c4b74a0c992c3271b993659cc79fbc63ceb5071b0240529ab3cae42f
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 10236 bytes
SHA-256: 5112bda9ce38771659084da7160ac79c66bf1e99b75823550ca6ec3295bb0cb1
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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