Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de88d7fd994f829…

MALICIOUS

PDF

80.8 KB Created: 2021-08-21 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8cf31cb8b90bcb94eed046a6996f150 SHA-1: 9c8db1a9550bcb578dd188d9fed9856ebcf88809 SHA-256: 1de88d7fd994f8299684832df86f1075e4cf7b613c7ac27a4123f5cd8613255f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised CMS uploads and disposable hosting domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts hosting PDF files suggests an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://ratsimae.eemedia/contents/file/6683745696.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/sexipenuzixiki.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/davagi.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/31daa4a9272f7e66f4eb1207f33af2fd/libajidet.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/83595393537.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3958fc1a---96693259312.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0d61b134cd956fd57b102368b02add2f/rukuruwuwevugutamizezuwo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-2/20210702183219846675.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/38d7dca0e72b26f66c4917c03d877938/32721028343.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aoc792qc8smonsn7otjgj7ta14/63420541828.pdfIn PDF document text
    • http://www.asslar.de/downloads/47696416878.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6881843de---bizipafuvenewaxozoda.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8ffbc7c5e8850e62d1a2f6b4bd4d3a73/79225484458.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210530_221632.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/99066135261.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/18e4b06d796426e71e9e6289589e445e/92857296347.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608482e866924---1063046894.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d963459213---90507734133.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3990088bfe---vonamuto.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/28784936710.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/pejilonebobetoto.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610c50b7b4b08---97814678498.pdfIn PDF document text
    • https://tsegypt.com/file/kededokelekip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+program+harbor+breeze+ceiling+fan+remotePDF link annotation
    • https://lapdonline.org/file/92673661346.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 17380 bytes
SHA-256: e165e04c5896e14a5d1ad361e568456551a04167e02cbf6ad4d9daca5fb85c64
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 11036 bytes
SHA-256: 19d46bde1a1492775e648aae7dcf72f41299a9ed28826a6a15378ee065d39853

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