Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72d5b8ffb5d8eea…

MALICIOUS

PDF

68.3 KB Created: 2021-06-07 04:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3756b59194742b6e279e4b0b00f6f0d6 SHA-1: 48df0f59a8fd8d1b5cf947222ea7c3a074532a0d SHA-256: c72d5b8ffb5d8eea5537dae6c78f443dedf58009918050d2316b70fd41e33656
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The primary URL, 'https://chcial.ru/uplcv?utm_term=lfs+6r+s3+unlocker+download', suggests a lure for downloading software. The ML classifier strongly indicates maliciousness, and the link farm structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=lfs+6r+s3+unlocker+download PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f84f9540f38ce0677911b71de8d9e0cb/86857139040.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122570a781---xoxevatalibubinav.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2849dd90fe2ff865dc2ec725ad5467db/gavonetutiruf.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/debde60404dc76793a92abd9afb1ae01/59808174822.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/d8f764c0790f2e5a8ea13083cbb3309b/93850868391.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/sekawubutabetipugosarim.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed58d1f996---palulixovetor.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/ladofedog.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e533a9f8---sigedulemojivu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a970da9c90c---kaxizotede.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71530c63e---20912051048.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/foneju.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/2204199006.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5ft85qcp6lo1ltni349u7t5enp/74629850333.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zebubiseviw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 5428 bytes
SHA-256: 95e7de271dbc2662132665df44b06927504e75f06d691f2c0ba8c93872fd6a27
font_01_sfnt_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 10456 bytes
SHA-256: 3acff401ba14b768269bb2d572bddce6e5fc6966f5f64b04e8178b1f84f67a80

Open this report in the interactive analyzer, or submit your own file for analysis.