Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f84d877831ffb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 11:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b82988347db9db5e572186b3046dcbd SHA-1: 3999a2cfabc7ad1d27671b0232ed8b6627cb4868 SHA-256: b70f84d877831ffb4a410b42da7b3f1e90f6a0f379937f0f4ee34cc42764119c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other unknown hosts, likely to serve a malicious payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5f427541---26484224134.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdfb65fe6---zoxotetimufekejodadotaf.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/8480284022.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/joderidurabaxonevuraj.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/35569412610.pdfIn PDF document text
    • https://iohrp.org/f_files/files/2779657928.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/dubiwumedabifexagewokexu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/bazefomulux.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/67739039510.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/88042254579.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/nuvomujezaxedarupakesipo.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/30087781278.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/29055309026.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/84315370286.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/daxenazizojud.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/58104944670.pdfIn PDF document text
    • http://goldmustang.ru/files/files/fozavepovovisokijokasali.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/panutebinugixipoziw.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/pufonilin.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/36817794944.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/40906457771.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/lotetimiruzizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ks3+balancing+equations+worksheetPDF link annotation
    • 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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 18516 bytes
SHA-256: a2fd01221dcc39284caa16298b55a1aaeac10510eeb001a97ce39528a34eb245
font_02_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 11236 bytes
SHA-256: 5c6eba874a65ac3f2f477c70aab441e24b3fca05ff5c4f4dabb6866a51465f20

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