Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7df02b086d3d58…

MALICIOUS

PDF

76.6 KB Created: 2021-08-31 20:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7badbdbbed3fc9abdaf147fa79fe7f7c SHA-1: 20f54202960e101bd617066e2c87a893533d1532 SHA-256: ee7df02b086d3d586babfc065edd386425495422e1d4a93a7ec0c96dcb7e578d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm hosted on compromised CMS upload storage. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://allytemp.ru/uplcv?utm_term=can+i+eat+rice+and+lose+weight PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e23a35248---pudetur.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/v4o9aml4ug2n184466fq9ghckn/75908457368.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ffe919cbf44907fa05b355db68aadeeb/53591689419.pdfIn PDF document text
    • https://soechi.net/userfiles/file/duromuvomav.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cec228a93---79965668311.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/32868089922.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/19784855828.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1358q9bt5hceg4h6bpiba8pvn6/44068795637.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c896acf4---25392523088.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160728a9a1331f---51437241554.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/36927610938.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d6e0db9d---34612922124.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/12246980437.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/4261539919.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/sesivibapexezusevabu.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sisotujudiso.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ndn63igf6ie2br918kq2jmqs4a/dakisezosedopapejukelikas.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/10546944621.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/masikokolamezozujazof.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49019032039.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bb4blb74m26l4eak7tlmjc4i5c/49875952500.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/minutovazazunoxuwelisobo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1c910751c---96636882844.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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10764 bytes
SHA-256: 535c98b0a9790b1565df06f88757314994d3078928eb2099f798b5ae94b15818
font_02_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 17256 bytes
SHA-256: 1e9cfbc033129925c3ea4590f9cffbbc05b603ca6e83f0e7a9db6fb48b4e59c4