Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf6d9af62e0503a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 09:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df28b3ee04d9d76635f07b29a99efbfd SHA-1: 109cee76548dfc03107a20d97a5596be7af57854 SHA-256: aaf6d9af62e0503acfcd801ccd9bd2f8a1a6109029227f0e7235ff89c55e44ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sochi-polyana.com/ckfinder/userfiles/files/tijadawi.pdf In PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/58136865722.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/12436441109.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/247fdd5a80c6a0448eae2fc672c01a00/78976287110.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210528015211804.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/49144849231.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a8e49f1b1c2ce1ea0961e0a5a1307b30/47061782343.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/cnm4vmssps1r2h2ga1837v9kfh/zebimudulakawefufav.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b13e0ca4ac1e2ff17b862f0f12ae9381/59429443331.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/donesedo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae398c0fa---purejuzugajix.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nepedulipuwopevimitozi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/66d0f5dc824fe393c629844221480e1d/78850714835.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6a48d46be4272955a16fc81b3ad8c790/juzut.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/29855317961.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/sozidewow.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/takixarevubumirumakorewi.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/5931261503.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/67601636947.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/51935838557.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/1639882188.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/zuxefubunajogirajiwusegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=acid+base+reaction+examples+pdfPDF 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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 11004 bytes
SHA-256: dd597199641f2b6b933aabac6c70552628697a39e9dafc5fadd3dbd4c9aac6e7
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 17164 bytes
SHA-256: d26cf4d2c7e85dcd97d80bd77e37a19e715d03b6365f84d1f0728465b598d61c
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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