Malicious PDF — malware analysis report

Static analysis result for SHA-256 e269a4d449795dee…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 21:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cfcc4d5546447ecd6fc36ddb9331043 SHA-1: 2dd3cb8120b624a931be6c356ff30789885a0af4 SHA-256: e269a4d449795deee6b99d322b5674b03db484ce4260ccd14751e817353d0b11
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as link farms or potentially compromised CMS uploads. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mashura.co/userfiles/files/86107569902.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/93695921417.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210715222610.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/64076931840.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/nurabi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/fitapepeke.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076305b4b7c9---fifagojobe.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a34fc1612---50592783885.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/vosomu.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/86911391956.pdfIn PDF document text
    • http://placc.info/up_image/1841290073.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/34230742046.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/838378383.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/21547676841.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62023984149.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/87082240855.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eaa62690a376e48df9336b4ebd0b5768/bupekonadiwo.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210808210003.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/3620a16ca106cc042ca96eb5f680fdcf/46935789806.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/35136471754.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/418d6d294e85a373ad24cc87d70bca79/dusilozugiti.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pkjan5d542lliqo4u6hleu6553/42142088297.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/99390214620.pdfIn PDF document text
    • http://arslanemlak.com/E/file/44001712540.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/39429109892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=little+pigeon+river+raftingPDF 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_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 19272 bytes
SHA-256: 5894d4aed50c0eafcdfdcda268220be8421b66fe871e5c44f780514b21857737
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10388 bytes
SHA-256: 0128478b7a013fa06734651a3d67afc052e15dc6d32bd14c6ac2bfe97a939eeb
font_02_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1