Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc76d44af044d29f…

MALICIOUS

PDF

89.6 KB Created: 2021-08-19 10:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f4665953b767a523d3f0696f1216ca98 SHA-1: 0c304bc22631fdf3d73e6e8e64320e237b319d61 SHA-256: cc76d44af044d29fc814bce1578de7b69ca2b1be0f7bfe5f75cda3b296ddc634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=igcse+math+revision+notes+pdf PDF link annotation
    • https://ngoctraithaibinhduong.com/uploads/news_file/modenekupalatixobokujut.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/87581330418.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/pomegojoxuropamutalamin.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4328b28ea85af56f4ffe3bcb28f0be4c/58370484998.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebodiwejojukegoforilu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d3070321b8a6f78647d807046712d517/50980161762.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vaton.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/io8bpk3hak5jvbn6gol4pt2m83/tujufejozakefakobibobomup.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zokowidur.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d805b762---pumubiwizi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074bd5e16322---fomerezo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6093b2aff6096bf3c00bda1246d0fd6e/zuriwunizob.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/67464405252.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/jojegobiguviv.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/7451749485.pdfIn PDF document text
    • http://autovoda.ru/upload/files/25080739720.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fvdbvm4j8u4tleic9s6d6l8907/dosetezitotapuzubevi.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xelemesu.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5371f29940462602e282595da6b1f656/42085007395.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/44338291794.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/tonikovomupopafiru.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82508ef41---betavakoxerisilo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ecba81514---xezotivirejexudij.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 18160 bytes
SHA-256: faae218252918dea31c87db8203951e6c34179e5bb608bd810a11611ec5a016f
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 11036 bytes
SHA-256: db0569e508f64ea6914248d0ba54afc17c009b3c3c6dbdd632049ee8d0b600ba

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