Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00e4981dbbfb1d4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 08:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4aaa85915ac44e9b1159fddd6a0e7fbb SHA-1: 992eb7207eb4859cbba3defbd8ee5d1cd3313b01 SHA-256: f00e4981dbbfb1d4dc892e95ded5573fcb7d2af70abf72132536e9270b7a38ed
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of link farms suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=best+ios+mmorpgs PDF link annotation
    • http://gabinetortodontyczny.eu/userfiles/file/pofewokevowusumuv.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/48143927939.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/zejujuwowerobubutibo.pdfIn PDF document text
    • http://newo.ru/files/files/zelas.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/piwefana.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/buvirij.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/1480238993.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/23931866532.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/362688348.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/68548547424.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/a5cf661ffeeac7ef531bed85a1ce66b5/67637924004.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/zugibewisut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e89810c8d---7095263268.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/79116763832.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/69685af07910a746248c6a65ef341437/82675606093.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7bf4318e871f456baf3fde8c5e1ffadc/wavog.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/63041802064.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/30119162542.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/75544872049.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/tuzese.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nazikisojusekagurotej.pdfIn PDF document text
    • http://lagrupacio.cat/file/fudavekerigameneta.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/38190065604.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 10336 bytes
SHA-256: 0e51701c30557049a6381158c2cd4178bc6a312a0fa62a044cc81ad86eece1d6
font_01_sfnt_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 19352 bytes
SHA-256: 047603e971738a691ffe1d1207551e90d879857a30e55dcccdd3c4636a9351b6
font_02_sfnt_off0000fdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1