Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2632188e6bfb32…

MALICIOUS

PDF

80.8 KB Created: 2021-07-02 22:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 300e36cacde6b1f86fcfa8a1f1d3166e SHA-1: 312cc3b04e05411dd7e11c640adc216650c9af28 SHA-256: 9e2632188e6bfb32c3a45c4265ac0964d0646c7ae215b1039b9814ea0a0689e7
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://beiwendq.com//data/attachment/file/lobigusipivavadagi.pdf In PDF document text
    • http://becucci.it/userfiles/files/66089966226.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d355d5ff8a---fiwitixobimesuwuloturum.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8af0e39c0---44532772573.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lozerenenominuka.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/nudinonuw.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/15113784927.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/55001403972.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/921248f49b81be1f7a31b348375acd9e/92750790949.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3b6536e558da397ff995225c9ea5c8fe/86898736315.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744cff117c7---sezojafosom.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cvmjjrv811tjnv3aucpp462t61/zuratupekafanasurufo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9ef480668b8bfad41db4a8eff360e42/depokirutanisate.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813e607ff77---pidanixokemubob.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae97a36e3---fubupupesegitujonafuxi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f9319c4b---81937949497.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69233973608.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7e685465---lafatikolidulekefefiza.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/bunixave.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/28194557556.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161793022725.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608293da1576e---nadufupewulorenof.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/xirerumogusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+princess+and+the+bodyguard+online+moviePDF 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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 16904 bytes
SHA-256: e0d49a9644c382e2011e151c0d1c861754cb2f5f736f3ae3069b7ce43fb3d1f4
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 11344 bytes
SHA-256: e3a58b07b671bca2b7b159c4d4474c8b80ed1bb26afbed05bbcacdbafe65e7cc
font_02_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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