Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db55cc56dcf3854…

MALICIOUS

PDF

72.3 KB Created: 2021-07-02 04:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59d4a2d0d0a429564f0c4db928a0d50b SHA-1: 7c2cd7e7b2a609089c562d399cb02d6b4ab88e05 SHA-256: 5db55cc56dcf38547169ab125ddea69d54bd2474c224945704e0152bc7b779da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.odnpoznan.pl/fotki/file/file/35918304561.pdf
    • https://weddingitaly.jp/images/file/rikukufolufimovaxisofe.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305b1a9d82---66062478955.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee5e338144---23138324172.pdf
    • http://www.iece.in/userfiles/file/57347499881.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ea2b9e88---vawokopekadebogusasik.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd8adc3862---meketetilavomeworalexuv.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hngmjebjcecv4dujc9m0eaojn3/37045553244.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/25m7ft8373g8js4bv1vv0qa9bt/sitewinabiwivasedin.pdf
    • https://psychologgia.pl/Upload/file/31963544878.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2d61f9a2---29979708121.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9375c8ff1---vukageredudazofek.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/pafumuwal.pdf
    • http://pgpartyrentals-decor.com/clients/9/9b/9b45d36a3a4d562467d70d81bd292783/File/67870944001.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9585e586e---75603198193.pdf
    • http://koryosushi.com/uploads/files/xeseloxafu.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cf5a49886---kebuw.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde2f87f53---10155364859.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fisogolikobonamis.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74512b0306---75957443711.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608badbe21f67---mixenimurawopawu.pdf
    • https://nocenzura.space/web/img/podborky/files/35818351798.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f2a932ee---sigalifuripized.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/32950305880.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+create+a+dataframe+from+another+dataframe+in+r
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9ed927601a4a1fb7be10f91c55345b79/jasikivobizuba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 16792 bytes
font_01_sfnt_off0000d2ad.bin
9db028d9e4bdbd8ccf4b5f0a9a2c5aa9f99bb953540cf4baabfafbd31f2b732a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 15660 bytes
font_02_sfnt_off0000fb2d.bin
678b211e0c292978a1e1349ee1827f842d296d31346d2e09fd48df682c2f69aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 10604 bytes

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