Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb49f4054aa78d79…

MALICIOUS

PDF

85.0 KB Created: 2021-07-13 17:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 97dcf4d93b5fae0243f7a0278cbdafc2 SHA-1: 994ee7f50f2ef4648da102cf8552cfa400994021 SHA-256: cb49f4054aa78d7981876f489c1bc05cf4d3a138738a5625ee8cfbfac1301957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081974608f19---zusonimu.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/6828727876.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bee795ba524---wumijesumevonax.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/43063d855900ef42fc6bef81103b5697/61930236649.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/bopokuna.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd424a8a64---62258589832.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973d2b3d71e---79869333324.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/73824388528.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/57241179603.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7iufc0acomebcjkti72bhm84ob/46994569729.pdfIn PDF document text
    • https://digireg.org/upload/xemonuxewebena.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5de45e44---bonavire.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/13aa4ab9a237edbbc8646cafaa10a754/gojalerunewe.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12cae5e31---35989669976.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nuvaxobogufatopaf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/v2u10c56gnqs6svutihpkv91k0/50863823374.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/84046959533.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zekavakiliz.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/64568072657.pdfIn PDF document text
    • http://mp-journal.com/media/file/9769102649.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ijogbfm6eb5ufa9kuq9097gqm2/92820252112.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/61642441243.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/sufadabojufifojigitoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gaap+generally+accepted+accounting+principles+pdfPDF 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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16740 bytes
SHA-256: 223f80131cdf4f0146929ebf7e777f864da13408de0527de51c75777a2cb2b10
font_01_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 11048 bytes
SHA-256: 0ad5e93989e145505c6e66150a8f376c519dc2ba74fc4da6fe3727f1bb58289a
font_02_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1