Malicious PDF — malware analysis report

Static analysis result for SHA-256 215e47a23217965a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 12:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b0bbdb6c997ff11ce9f26f112e6d08d SHA-1: 57ef830a73b14465f8b304a16cd5687f71792d1b SHA-256: 215e47a23217965ab98dff9e599f2010d366ba87b703fca36d8462eda3930cc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that functions as a link farm, directing users to potentially malicious PDF files hosted on compromised websites. The presence of numerous links to disposable or compromised hosting, coupled with a high ML classifier score and ClamAV detection, indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure suggests an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=augusto+cury+ansiedade+pdf+download PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f340c5826102ffd49e3f8229d6cd6980/49392586439.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe7f029e3b---wedog.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ddakdaopnt2l5b76h10go6crah/31537774470.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zifosilikewibalitu.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/judijuxovazemodazonovu.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/62918800442.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/475054ec8a97dd1518a8e70b876c4805/sujik.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/815f9a5f2b8be67544018a4c91b42326/xugewixutamaxowar.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/14229496053.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4diglaqrdj64s734heq7q0b3pp/zurapokonibesodemezoze.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/dd8213b8740ae7f81428efd739a305a0/lizotagukewopewo.pdfIn PDF document text
    • http://riversedgefm.com/files/file/22242721098.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hq7r4jbgg788pvq33igp3bfd6f/jujelutumagokox.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210817061321_ogyur6.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/46484677433.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/devenokozate.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabba061a6---3451540572.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/66498102259.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jekojujoj.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca55c39b---liziregulitasizi.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/pufonajivusajerafo.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_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 11076 bytes
SHA-256: 903f48258d8184fc5593757be4b155023893a8e6828c5bdef6c769265425ef12
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 18004 bytes
SHA-256: 1ab1c1d8ff2a01787eac2e51ca74ac85eaf627324b260d7485e3e36d83a5731e
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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