Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebf1ca97c41c4d5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-30 18:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e60c088f0c6c249ebb02c4ac9dfd73d2 SHA-1: f51ab914aea1618cd727dc1e70596fb303a7f448 SHA-256: 0ebf1ca97c41c4d51e7a6e094f69af7dbfa8186f0c32807944a351f70969a38d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting. The embedded URLs, such as http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100413897bb9---82024762508.pdf, are likely used to host or redirect to malicious content, fitting the pattern of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f117397b---37748159922.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f876573312---wilojisorosu.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee104d5129---68850432856.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100413897bb9---82024762508.pdf
    • http://hoangnamjsc.com/upload/files/49725744636.pdf
    • https://am-system.eu/ckfinder/userfiles/files/darofim.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b88d50dc3fd545b7cfb8b46ad8731eaf/93988774492.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9772d842713428e6eea2b4ff616afc57/roburaba.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/178jtm29bjcb1679njm8140ivd/53918688599.pdf
    • http://notarbrazda.cz/userfiles/file/15611404651.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/a64gmmj5ippfmhjarttht6pj4j/79848821372.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096913441edb---wajiwidili.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9466226da264db61fdc6a2316c131409/68763177803.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f7a12c611faa4984f6af85f74b58cff2/dopawukut.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878e82374e2---69718446081.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/37e8b38b84d236c1982c84433333dfc6/83517138225.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/85915573600.pdf
    • https://accuratesearch.com/userfiles/file/wufakajumegimoriduwivoni.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8ace61c1---62681279803.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d6007ce8f00498b02f693e197e6c82e1/fusagufomamazazanuf.pdf
    • http://dralituncer.net/userfiles/file/92793941797.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/0cbc3f18cd2ece436d77c6fe712f18fa/78798435655.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=configurar+controle+tv+samsung
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c5.bin
80bf67f57ccfc6ea2f85eb7c0a0043fb6d7a08da76c6542651742d7b1e815e09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10876 bytes
font_01_sfnt_off000102fd.bin
5bfcb050ab7361549f68125933f10f4e50e930ce5cb96ef1f18bb240dea1eeb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 18956 bytes
font_02_sfnt_off000131bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 16792 bytes