Malicious PDF — malware analysis report

Static analysis result for SHA-256 90403d75f56e6624…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 18:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f73f71c8eecfbb9c415150885c65203c SHA-1: 1948b10c584025f5ead09f49b56f64b5c7f8f460 SHA-256: 90403d75f56e66241b3590a15ae3945554cf1a192134c2dc311abc39e7b23b89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7fe4612e9---69896769246.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608194205ca97---zusinupixofidofolorobi.pdf
    • https://nikosdimos.gr/userfiles/file/zegakuwa.pdf
    • https://mmszke.hu/files/file/duwufiwelowulip.pdf
    • http://www.hangmandigital.com/files/file/gixevefejuvabi.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9de5c7ea53a9a24bcfaaa4230fdce674/72779929684.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/29b7c76178230ed570479a4a3ddbaa77/83004069878.pdf
    • http://pc75.net/upfiles/file/1621894192.pdf
    • http://mav-auto.ru/images/file/pisukutuku.pdf
    • http://ascensionchina.com/userfiles/file/zamozuxisigajoxifop.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3fc062e7---87119049041.pdf
    • http://ufnk.fr/app/webroot/files/file/kesafobuvewuwiboz.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3b7e4968---91975285237.pdf
    • http://ellev.fr/upload/files/93149630516.pdf
    • http://goteneplast.se/files/images/file/linowaliwuxutodomekal.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14403406780.pdf
    • http://accessprecision.com/userfiles/file/42783730910.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44fde10c3---godimaribizanuteno.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084422c92bf2---51796310823.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/olin2tb6ufoca37m1rhs4662v6/sividizuxawig.pdf
    • https://chmelo.hu/sites/default/files/file/bolagezelamafuzosorovevir.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4ts15l5s5ta0guirrqen1m9fe/subonur.pdf
    • http://karimeh.com/public/userfiles/file/rekapujidomapugarututopam.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dc2113c3c7bb6064930a1af5f05d9522/sinix.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/i57foa946rtgued7g4hicjjhl2/11988458593.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a351e9da---74896585572.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+weathers+marble+and+limestone
    • 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_off00010ca4.bin
fde68e4ed992126c4bdc3b90ee1f68cf2092271da10006562712f15916b5c740
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10732 bytes
font_01_sfnt_off00012521.bin
ba6161608820491aa9f1f5bc13220b0801f03a8f8b3b5ad5c7b5a98cbdb3a804
pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 17516 bytes
font_02_sfnt_off00015323.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15323 16792 bytes