Malicious PDF — malware analysis report

Static analysis result for SHA-256 178ddfefa6f8c18b…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 04:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e8db953f159b1b345e238e0f3fcae1e SHA-1: 090f369643f158b80602aa01699e3b4be2ac50e6 SHA-256: 178ddfefa6f8c18b944a272eda32322001219d59788125ca5ea29b1607fb4837
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8fcudsss560kccatpvook0kkqn/70641241679.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/33719341422.pdf
    • https://candbco.com/ckfinder/userfiles/files/tavesugowutusa.pdf
    • http://sjar-tech.com/uploadfile/file///2021060313363593.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac3f03eef---sogagisidiv.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1d3337c5---51950561794.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bbqcp9bp9sp9slvru7namn9941/14562016437.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8562ep4cft8onhqrdh6steohug/zosasivavuzavaze.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/506a25ad6faec48f4ac3c5f356cfac5f/47184128977.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/85fe69f49ba61a58644f2cd1dae487b0/rajezuwunetagipugujofu.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8f30b6827c20745fb211c54dfa579a20/64468671559.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/58d6b0c46e418cc68cca00252e02564e/xosoxide.pdf
    • http://scro.ru/pic/file/50786588843.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/10110830921.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bba06d49b8a0e64e0f7eac2c6d0ea237/jonadudobizemoz.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a88dd0dbc---54161577244.pdf
    • http://accessiblevehicleservices.com/userfiles/file/tagejo.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928d50459da---rufawuj.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/4d17229d00f8bb8e2add775a93b65424/xigisetera.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c80fb2261---15837954915.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wim+hof+cold+therapy
    • 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_off0000f298.bin
eea90372a75c9bf7e9164b9053657b4d610dfa0a9ef3f6236cf374bd293d256d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 10720 bytes
font_01_sfnt_off00010b33.bin
7ce15a84e343573e2491d7e838c4ff1f6453a929f38640ce866d84faeb6b0990
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 16692 bytes
font_02_sfnt_off000136b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes