Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f37fdf1ca548ab…

MALICIOUS

PDF

90.8 KB Created: 2021-06-30 10:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64a0932ee7d9b89a705f30d3449cb5b9 SHA-1: 189037d8687e58ec7186a8c6c374374e1320c527 SHA-256: a8f37fdf1ca548ab0d7414407fd1d9456923e1be368586d4292e42d6e62eafc1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary function appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=living+in+a+chateau PDF link annotation
    • https://mokhalasati.com/userfiles/files/73593728827.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sf4jcqsa0t09n2970bufqhv4k3/4584168968.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pohgpca416frpi7pbapmeact55/xedavokexugujazam.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1417b156af383070de23d6f6c3df0574/93033753565.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/46496718181.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b3f083db86ecaf8445b7c1cb09cfbdc5/6752038309.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/563f21e6f50924aed39ed595faa3baa9/35875066751.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/nugovoregirokuxuse.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3oa57os82sif81u7al7uhlmvgk/29839803132.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36c51493f---36968784453.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862de7e02bd---17062952600.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16249211028087.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/97948234743.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/85347851634.pdfIn PDF document text
    • http://ruresept.ru/files/file/bosodujexojo.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbf0c1044---968730325.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085be901ed7f---meneforamaxora.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160853a576aaeb---voweludo.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/xolenirutugunajovibido.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/3854128434.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f411ebe2d0---26304675787.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e257ca63---63034050649.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_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 18416 bytes
SHA-256: 52f2c3948f5026e19eef2b5ef38cc2be5cbe997abc16b27253b7ea5cdaaba279
font_01_sfnt_off00012f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F89 10196 bytes
SHA-256: d590cf7a5912e86844ede06df8ee8f07d0fc714a8c649912d75b7dd63fc2619b
font_02_sfnt_off0001465a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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