Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dd83f0017b3647…

MALICIOUS

PDF

134.9 KB Created: 2021-06-30 10:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b8febe8c34641f52da2b16b1b10bee5 SHA-1: f0afe8a3762bffc7d50f4ceb209031f597d830db SHA-256: f3dd83f0017b36470ddc5233e5aa677aa1fc60648283a715a5eaa1f46baad8a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://cructi.ru/uplcv?utm_term=complements+in+tagalog PDF link annotation
    • http://kamnitikamini.si/upload/files/40692556718.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ffc397dba---6760992113.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4aae47dee---68557898961.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kukekokigoxonazenulewu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kupogofakafaxini.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/98043077815.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/16365325628.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a824c8933---momade.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9r795pb2vq9q2uv96adod8p90e/pufaz.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/29968081503.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/fuxemexemikifigenebo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/n2to6dkjet0k33ptqve6qalum0/26067503397.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ea8c68414fae21f98d08911fc7b2b7bc/11655968396.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/128c1df669b4acbaa569b58ac0c1ecc2/7164605231.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c8240cf0d1b821f5c7f174526897069d/8496296106.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/l9jgp9j831rcfu7kpu5a3obsag/81339316469.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/jalokudizerufizugiget.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ad524fd29af9126a15477999d14e4458/judixilag.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b8b4df44281308b7c934d6ae3a02e756/70210496324.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/sodigaze.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/pefux.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c38aaf916a6---dawitijesetig.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/36038289838.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a18e2d5cc---10010998718.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62ef13b9f---wifotefupezakejobu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAF 10528 bytes
SHA-256: 277982e232ea5c89f83dc12afb33d9b9736c85d4e5148d09040cc315a9e9b5cd
font_02_sfnt_off0001b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B59A 1908 bytes
SHA-256: f1a1d9b47b5eee2fade882070c3332651c81c60b8e604f9a9b670748226e5382
font_03_sfnt_off0001be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE64 21964 bytes
SHA-256: 8eab56a7ffdceaeb7d91df5428755c5d3fddeb320601edb524c025b358dc0ad3
font_04_sfnt_off0001f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6EA 16280 bytes
SHA-256: 4f449dda0d9725a06eedeff7bc3c143fad980f0518aca35e7c51b9941f1e44c1

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