Malicious PDF — malware analysis report

Static analysis result for SHA-256 e480a5063537c3a7…

MALICIOUS

PDF

91.1 KB Created: 2021-07-30 03:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6525a6a4955123999c84c8475c2fed6 SHA-1: eabdfb7d62fdc4769e97e88866756371d934a1ef SHA-256: e480a5063537c3a753d59d4fa2169d4a3baba9128d5a82d7a90adc7d04c036ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/884tei7n65imkf07svcg15su8h/13564013110.pdf In PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/labawesilinutubetenomal.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/dulizexerup.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5aaf182e14b1f339bab56ea92ab3326a/fegajaxokosidupavuzida.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/83210939442.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/xagubajesi.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/2955731825.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae2c88e97---tidejezowezitojag.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/fazexarulefag.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922871a720a---88170880248.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/59dae27c0076447d45a8674ceba0eb06/xilupunubefefojenenelij.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/tazegako.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc1a8dd235---tadilikogatidof.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/zijutoranu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/jarilop.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c794be313683e9e8be1a6f0348f134c5/bazapodukigapemobirivi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/440d24c647064df31702af0bae649610/79098285004.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81ca0df9d5---25421597435.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/88692369067.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6e1499ca2ba4fd5f0c7ecf483cde5e4e/5282992460.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/533873ee6e17783f2ed9bff6c443b958/diranuk.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/aa07fe1df496c6781a055c0ef012e05e/nopefenirewezas.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63958ecbaf---mijojobafifefeneledabiw.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2cbb6d9974fb608feee73a719894f46d/duwinulekikalufex.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/pekijoposos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ikea+poang+armchair+assembly+instructionsPDF 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_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 11216 bytes
SHA-256: ac257c908f5107f3fad3cd7c4382341f1a7fa71c549e4a9765846177f04365eb
font_01_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 17776 bytes
SHA-256: aee8363362d8d943e6d23da94abd4493a5d2a4345f896eb0cade02b6a4b260bc
font_02_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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