Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc306c2bea36ed2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 23:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5923e30f85b213c87bb3578ae3522a1a SHA-1: a9f6eab5a8f7efd2ea5529cd4fe0a9490c6768a6 SHA-256: ddc306c2bea36ed2b1a1072a40afd770498fe181488981c88eb928778e6ca336
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and link farm heuristics supports this assessment. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16077273d44d47---85521933926.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/73519945736.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2c3e33bab347b6331127049775e34209/56575974527.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d91bc5e6---20474687018.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/980a0cjqk64fajrppsfekc7vtm/topiwalixomomobafe.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2c20337b81d1e217422e9bfe48c7f628/50480409571.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f4698fee---xuwududeg.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/29/25709016792.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/patudifebas.pdfIn PDF document text
    • https://parfumzone.ro/files/file/29734556825.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/xejevulivasafipurusav.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/58743680219.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/24478551602.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/80e4ad324788aec38f3e827b6911b295/mefabef.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/jigopu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/10761763779.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de80e04a8---vuvufi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89676611697.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a442ec35f7f8726f1f3910739451c55/vuvuvusegokixino.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081602ca3cfd---10447934693.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/503a662b19ead514c1f401cd317d3d59/11845755957.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/jimodumabogak.pdfIn PDF document text
    • http://landia-print.com/pdir/file/77044992562.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/35976379905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=organelles+of+the+plant+cell+worksheet+answersPDF 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_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 15532 bytes
SHA-256: 0d17851c4169345f34f990e84ed0120857d194391661fa533e72a041ce45e87e
font_01_sfnt_off0000e546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 10872 bytes
SHA-256: 9060024023bbd0a703c40b6d9c5d905e82c8759ce003e1273b79859ba44bd4bc