Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a33bcbb4c903546…

MALICIOUS

PDF

93.4 KB Created: 2021-07-08 07:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 980c727b8fe93dd4d931b63bd97be78e SHA-1: a0614589ba5d5e568bbeb16d951ab92ff49189a6 SHA-256: 6a33bcbb4c9035464ac1a0d98c865d2ccd7751be3ced1e25f0e73ad189d555d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, likely intended to trick users into downloading malicious files under the guise of a book list. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://pistant.ru/uplcv?utm_term=1000+books+to+read+before+you+die+list+pdf PDF link annotation
    • http://bclgrouptt.com/userfiles/file/wovivedu.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/gananilexerawaxopeli.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c5a11dd71644cf549e5e84b7fe09dfe1/10677819552.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160931ba899a58---natotijekubevenujupu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qnlga3adnh2g6akj6f8pfuofd2/13969251405.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/65454584329cfbfff7664cd8f98dd90c/70032948716.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49858afffbf521e6853ca3fb01aeb8fd/42380481095.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/7219287670.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/banegapipibazaki.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/pavirawipiditim.pdfIn PDF document text
    • http://rjt1.org/upload/files/wilorebumufetamofovat.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fcd0a3e8---zojire.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f35abc4957---wobesovokajiza.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d198f889d7e---xusukakalefegizo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/jorevaz.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5c791ab5---kowotabaramixesixaser.pdfIn PDF document text
    • http://goref.ru/files/file/bokol.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/garolixasamase.pdfIn PDF document text
    • https://serka.com/serka/upload/files/joxine.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/211527c7c787de0ae6c91d85adb37f17/bonuwixov.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb45e8cca5---84286657108.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/74083987999.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/sugatemoxakiregunovaf.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b8a17046---roxinaler.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/e93kiphk6eoo284e9t3tk8j6l9/98489115477.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6855304968---92162457413.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/mokixewek.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_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10908 bytes
SHA-256: a289376a40505536b9b8058e269b4e2a5d27060c7d8a9eb9640bca6dc9d3b600
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 17336 bytes
SHA-256: 09e18133fe1e0646cf47062247a8b2e20d2ecdcb27fccaf605dd2047ff73ea74
font_02_sfnt_off00014f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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