Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32d680b3f85b75c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 10:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8409ce5910554adc0e22efe7883e4dd SHA-1: 3dcd9bc185b89cb4c699f84e37036d23743aeb72 SHA-256: f32d680b3f85b75c268e00a639a9fb40df25e0c3ed5dbc3ddf043ceb62bde43a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated, but the heuristics and URL analysis suggest the primary purpose is to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/21e5b22e9de974872941b8387d6ab5e0/52386061207.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/walokurebipipizupu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e821f441---vakopatorunala.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84661f114---gutokefiribokozuka.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8f2d3134ddfc89a7be6e0149eb87a139/farinixase.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/27481857471.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/gagekamakirawulewule.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/depusemutiganoxaxuwojat.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/19400346687.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4c32dcf8fb055269afeb9ffebf145f45/lawokanereketaj.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/wetewudekewaximid.pdfIn PDF document text
    • http://elsped.hu/files/file/towowejipogipumazez.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3ab9d52cb---10341726061.pdfIn PDF document text
    • https://noddy.nu/images/file/sujerumepenin.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/85571493514.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/26b48a96e500548170c9aa8331942c78/vujulupexovexutadewi.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/rozibufawore.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/17051623405.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/tasube.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/mosexesorowofofedile.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/58255835968.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076986f23593---wexunoboxiwonematilenifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pinworms+on+facePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/55ff39a4dfa7b0bf2b8c69a1e6ae2400/40825483502.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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16976 bytes
SHA-256: 6607d7ccd66356aac92b362300af4bfef81f52a982c05d93acf1c1e2a8f37021
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 10440 bytes
SHA-256: 52e157f3dee6bec7b93658d0af34940101b5e260602544c89f8d9ad9ef61d349