Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff562e6f1b175bed…

MALICIOUS

PDF

103.2 KB Created: 2021-07-17 15:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 134318b0ae93986e2929f0380dc89229 SHA-1: 3d38bd7d85228a830b202936db4b7e800436f4b4 SHA-256: ff562e6f1b175bed640dfb2212d2490354b4b15131dccc4927c73773d1a978b4
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, suggesting an intent to lure users to malicious sites. The presence of external URIs and link farm indicators strongly supports a phishing or malware distribution 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 http://www.contectrade.hu/fckfiles/file/69239638980.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa3bce4a2---54256159678.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dthh9946ujq9es8p8lhgo6l05s/vipazut.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r8chc4kgh63hmo73fcsuai1dar/33988925498.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/piveputugevigedupejolu.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///mejavanuxifizanekenubuwox.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/gibisewenapekaranuzupow.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/sabatudajasigazu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/2dnkvloomng08vqka7sgue588f/letubejoposawuxojawutuja.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e58208782---55373207956.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b41670a33---55912375064.pdfIn PDF document text
    • https://loctra.net/userfiles/file/22000773416.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde072be9b---51881285967.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/nijanokaz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcba9822c8---nixerisitetamakoj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1aaba2076---97923885438.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/66329530043.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160822d48cfd14---65776041794.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zexafexobigawozeg.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/libejajun.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/63929153081.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea58c5ca3---63240862914.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2vve68qfc970oh1pjcrj6irv9a/69525438254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=limbic+system+physiologyPDF 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_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A27 17856 bytes
SHA-256: 5326002c7a039f9aa150eb96b256a9ae3c0663d088d41560b9ab0ce20ca28766
font_02_sfnt_off00017751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17751 10668 bytes
SHA-256: 2e7a1b60d9190f8a9aeecb275378f02727a72a913777101b3b0525c6500055e0

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