Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcb2fbc73a64578…

MALICIOUS

PDF

86.6 KB Created: 2021-08-26 06:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5fe21017851fa60a7486dfb47c1dc89 SHA-1: 32d195a69651cefa85060be62e9f78764b553fc6 SHA-256: afcb2fbc73a64578a6091a0f840325473f3bbee95d99f7d44dd3f8278350f44c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8039b1d7c5---69533730666.pdf In PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/mupizenadifivuro.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f48aff6760a---pakukezunogijifad.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/27360497425.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612523bd8bf5d---femovufadub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1bac92fc---nobijal.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/27ae7945372cf0a252c3485f5beda565/lewesisigerefegivevapesaw.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/nojukukazipevesin.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/xokesukipizedevopodokevex.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/xuzawetudekamixewut.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90db39e9ac588097540179142fd853e5/60382683903.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/61v60ljfmoi2hnpf9uefnm46g0/74159563697.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f25e2c7bb7cc4dd3bc7e0d09e7e710bf/90348048890.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/12580001735.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e79d1622fb3---zuxidikim.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mspunr3ssr2g2u93t76ahh7b5o/wukunefizefilaziligefe.pdfIn PDF document text
    • https://fallsplat.se/file/fixasefupogoxokux.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/zewivuzifelopamafukosexo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/26b6939811db0dcfc04154b2cb90d6db/tilusoboxuzogalefageze.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f649b42c82d---72271129439.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a333a4bd3---65146396848.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/kiwefelotatonogotifedaj.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/nezadazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=combine+multiple+photos+into+one+filePDF 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_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 18296 bytes
SHA-256: 5c86ac1a86ac8b46340f1f272a93e649e349278b9f78eb4f849f63b057878c0f
font_01_sfnt_off00011b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 10632 bytes
SHA-256: 538b76a61255497e4c34ccce1abbf8525c4a6f3e31650449cbbb8837b658a601

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