Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5180e4e8ff9dca…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 10:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 925ef5cc1f50cf4444f551f43930c885 SHA-1: 6524b60c6d5e99c61eb3f22a92ecc0776fc4896c SHA-256: 4f5180e4e8ff9dca84a93edc626b2f8bdf4609f193b0179462d081c27a14df70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a0fd52bae5f9d7dec070207936b97be6/48537285705.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/733fcfa6b4e30fcaf597564f82d6462e/23202718619.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ee8il45rbac7of5abud5rar41q/dawix.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/32116429137.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8267fe793d---xowazefumefefejefile.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9db2e2c93---71039688174.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/9rk03k2gq6kl73b4dtm5plgqem/92400017973.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/95623914933.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5aadf9b5ec0c5c067e98cb557b925c73/97053239093.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/suluwokilumidinusajati.pdfIn PDF document text
    • http://effektfilm.de/files/file/4406048779.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/komulogasipit.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d822641d41---sejeje.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f99cd30ac---9286060060.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/62982142283.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/gukamapomozega.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/880kovqoe8soc7eqafn92d79d1/kanusakusamopejerupa.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d57bf733---23042717843.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/delewisatumononugo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e53f1169eab---77371547832.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/7047066365.pdfIn PDF document text
    • https://5uempat.com/contents//files/23421580145.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bvovkp2l86v52flhkcqqfq40d2/fobawedudatunamoxudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+beauty+mole+removal+sweep+spot+pen+for+skin+tagsPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/24028465956.pdfIn PDF document text
    • 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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 11292 bytes
SHA-256: 589a5e9eddd293bf4eeac0061138de7eb1cc5968fbe865f69069bde754054a74
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 17172 bytes
SHA-256: e8fd920ff09ef9420a48d0053a8c9e5a5a2b8024ba0f291f3a98b060e65a0c04
font_02_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1