Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f3bb0b6ca4a68e…

MALICIOUS

PDF

80.0 KB Created: 2021-07-04 05:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5994f8de54a9e89da4433f6c40fa144 SHA-1: c82945ce4aa31eb6f0478ef9ec43feab9fe28c78 SHA-256: 97f3bb0b6ca4a68e3ca193c9f89b9d074fde8484462dfed82c225404a26c2f5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites. These links are likely intended to redirect users to malicious content or phishing pages, consistent with a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=middle+names+starting+with+j+female
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3285c415a1---49213396929.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a83502c555b---42323729659.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/pipenoxijiti.pdf
    • http://kasargod.net/uploads/file/jevalefotogupegow.pdf
    • https://manuscripthandler.com/userfiles/file/segutekotopotoroxo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79f06b2c6c---87641129019.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c846309f3---5698442358.pdf
    • http://vom-ragnaroek.de/uploads/file/renezasov.pdf
    • http://zhengfutz.com/v15/Upload/file/2021611955501470.pdf
    • http://amctop.com/board_data/editor_img/file/202106210756.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80661cd85---libuwifagudex.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/masenoxuviletebakulopa.pdf
    • https://vatlieutaphu.com/upload/files/jepibojizope.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c2c1pj22i4liv8a9acnahu3ti4/fegitikujasub.pdf
    • https://spacio.hk/attachment/file/51963544908.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/geoipkn953gv34em1a19ctto14/tidosatejugovelojazazi.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/jezajejedokopelawit.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16de8d5ab---todokinigubituweronizale.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160858199b1d38---jejuvozagidis.pdf
    • https://aartipalette.com/userfiles/file/34709420459.pdf
    • http://aggengr.com/uploads/CMS/file/71063454188.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_off0000d40b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 16792 bytes
font_01_sfnt_off0000ec1d.bin
e314c7b0be97d25aa4e71bd86a5b93074a80c525efc3c5fa94963a757fc4d78a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 16916 bytes
font_02_sfnt_off0001185b.bin
dc33c21d88b63a63c1eea7b400f9b0277ad141d45497fb32379584db11f6950f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 10892 bytes