Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdb96600cb4564e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 23:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 462b59429b4c9d651c91af2689a4d037 SHA-1: 6ff35e116205a686f00ba91e758a3519ed2e1a93 SHA-256: 4cdb96600cb4564e5c3971d61f698e136657fd48151d249bd3487c28dc981d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The primary function appears to be redirecting users through a chain of links, likely to a phishing site or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=most+popular+android+devices+2021 PDF link annotation
    • http://terremeraude.com/userfiles/file/rodewedegav.pdfIn PDF document text
    • http://msiutilities.biz/documents/30753649870.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/79539838386.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ecea296d5ba963d039e7b4df1b6d0169/xasimatujatomegegi.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903214246.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/76133537740.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd205696e---digosuregowi.pdfIn PDF document text
    • http://lovesenergy.com/file/16269720314.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/desufekunuboruveweriwofaj.pdfIn PDF document text
    • http://zuche0551.com/upload/file/33739913332.pdfIn PDF document text
    • http://regcureguide.com/files/files/kanudubavubebokotuwevepen.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/dibigixogikukidogefogiboz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613002cb86878---bazirew.pdfIn PDF document text
    • http://mextro.de/upload/files/2600948749.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vatalutazuwa.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/lejilekemijubiweduwajid.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/83290630805.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/sevasir.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/wigajoxizek.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/11949299870.pdfIn PDF document text
    • http://wirheiraten.de/images/file/16213246241.pdfIn PDF document text
    • https://duel.pl/userfiles/file/14464936037.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/19421851467.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/jaxumiw.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/77661846475.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/fulodewipow.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 18488 bytes
SHA-256: 62c106c073a4248c1bfee8af60b753377c44d7b28bf1e35dd40d1d2585de4911
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 10960 bytes
SHA-256: 811974c92dddb21d35ac47fe98152f626130e352367e949bdfc9226ad4de9cc6

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