Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39efe215a0f5951…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 01:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15abef82d345b087a06792a6b8f82e7b SHA-1: ca261dc636f003e142401906ee80dcb767f9da7a SHA-256: f39efe215a0f5951427a62509545041b4ea2b50edb4727f6cd4794f05eaeec85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of JavaScript and the link farm structure strongly suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=price+of+android+phones+in+nepal PDF link annotation
    • http://aviapartner.biz/js/ckfinder/userfiles/files/73958746095.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/88124236645.pdfIn PDF document text
    • https://aayams.com/userfiles/file/vuwak.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bf4f3df4d38ae49b50460a6ad8562314/lunutut.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/50902517022.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/xuxubafupujesodategasilov.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/66091218173.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/85878916249.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/61079645179.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nafuribirawajaraneked.pdfIn PDF document text
    • http://primaneighbors.com/userimages/6278167774.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615240b157ba4---69723269796.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/90180973605.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/megejofeletoxunaka.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/24586574998.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zabujufopobapisebe.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/44299206670.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161467b68957fe---xosodiluru.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/batatiwotesug.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/621f81f3481d950ad37acce1acfd18b1/77830303305.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/26885398579.pdfIn PDF document text
    • https://agros.net/uploads/file/3691273909.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/2762470868.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/lavolifagazofakazajomu.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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 10620 bytes
SHA-256: ce5d36207527e82b3554081479200d661a370bdd63ce927bc9638f3f474ab9a5
font_01_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 14544 bytes
SHA-256: 6df65d8c193b5e34615accf226fed62a13b8453731423c5fc54aefbf8f09f40b