Malicious PDF — malware analysis report

Static analysis result for SHA-256 8801dc2c0726a64b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 04:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f37d3e4432798064c131ca88b3c348b SHA-1: 479e5426a6ee5dccf168f8a7d6ffe7e83fdd0b03 SHA-256: 8801dc2c0726a64bb93e6e14a805b70bff7ba9fe59ed6628a119faf302322dcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=p+channel+mosfet+working+pdf PDF link annotation
    • http://italianopizzeria-pg.com/uploads/files/lupupikemeguboxavitax.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/rozalavobuwe.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/jolinomubaduzup.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/19968090553.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c85eb60419---nejose.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/46797337746.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/25020739357.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wuvutunelazofajasesom.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/tafatumama.pdfIn PDF document text
    • https://argumentua.com/i/file/nifofogimaxenejuz.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xazoxow.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/35974530993.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160707d303fe66---zexopodobagamab.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/10722005711.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/zofulewi.pdfIn PDF document text
    • https://jobtiara.com/files/files/tupesujilebaxafikufebab.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c216a6c8---48924055888.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fakofuduponigebuja.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/mitumubepozodimuvajixes.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/6181061843.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210708002627_l6x26m.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zofagamosabomogugur.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/59aec2e3b1008599a9aeee82bbe341fd/pimuvibodaxekajikomumuti.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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 17088 bytes
SHA-256: ca9249f4665fc1204fe657311c0f505bc81734b135dfeb21e538162baaad85f1
font_02_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 11244 bytes
SHA-256: 7fe5793e38ff2b08f5140f72b4810ad9aa0e7ee851d41a64cf6be9510f7673ae

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