Malicious PDF — malware analysis report

Static analysis result for SHA-256 5194ea2fa20ed871…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 21:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3cee155eac29bd663a2f47332dcfb9de SHA-1: b096c441e34cec66a701a4895bc43a6fc3694b05 SHA-256: 5194ea2fa20ed8710a21c419bca00961a80ff858169d28e38b5c87d47e4c85ea
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple links on potentially disposable hosting supports this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6aff7e9672705611a42d3267f76f950/555257130.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22a990d1a---jumuvekanojot.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a623c4d17f9---gumaxiroviru.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ae6d4c64---xokadovusixex.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/70803569647.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/kovusanibupaxapukudawoto.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd949d15747---25192052614.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c0e744cd---lirovu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da58097e02b---bimivuzapimaxosofamexa.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lulumunuwibosip.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/1b3a983fd59534d1701e5b7f4c3824f5/50925582646.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/jonuja.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/30124224347.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec346c7cd---taputexalinugulebeva.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec1634f5---67721250775.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/33392307870.pdfIn PDF document text
    • http://mextro.de/upload/files/6274516196.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/afc47afeb1fa5c3ccbf25a841df57bc8/84320716256.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767e1222b35---25396921711.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021062718185613.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/walusanaxagefutiwos.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/p3j4q3nenlj9ic8nrpv3lnke5m/bisevawaniradebug.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2699f0526e9a06299f921620b20e6345/varatemiperena.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/84d225638a7d213b21d58ab453bb5013/tolomevewavomaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fur+elise+easy+piano+notes+with+lettersPDF 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_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10624 bytes
SHA-256: 449f254b330b013985d7c7c05bdb03537c69e7c7a6f1705398350c6508c4cb17
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 17300 bytes
SHA-256: a10da0ccbe4669848956b152ca2e6586e6cdb497b99081cc560a9e56e17436fc
font_02_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1