Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1a4e75abeb3194…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 11:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19c98dbdee2cbcede83d29240b346224 SHA-1: 19f762c287a27961b73f51aecf10b25f2e1c3fc6 SHA-256: dd1a4e75abeb3194fba2d35b9c9ce505deb5f49913107a6ce19d59ddfc6fed0c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to host or redirect to further malicious content, such as a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/33618737045.pdf In PDF document text
    • http://studioriboldi.eu/userfiles/files/wutanuluwirarakudin.pdfIn PDF document text
    • https://zhansq.cn/upload/file/78983499619.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/213f51621b1a221bf36b80cc2783c22a/89540035392.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/vasefekesedugorosekegema.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/joiot5flkhqucc5qt9f3hpkiq6/26106618347.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7f9c74e---16083084590.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/99027279051.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/95454162311.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/vexexatiwig.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/morovuwasanawomimutol.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/kutewef.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/12965643243.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/vipilalajetovusixo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085bda8ac7ae---dagitifesa.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/65136994945.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/donepanetirugowodag.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/paxosadasufibelonulofo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/du9e4gd8nqf61bl6id4inqu2eq/zabenibibowebipupugave.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ramasgc7lulaiaph5cdjk598n6/51473140371.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f68de330---jodarabanalawudaretoloj.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e79b32065---19465937224.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/tukewigapew.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b2ac68d9---178031864.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eadd51f513---tazabebured.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/96210529618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+of+certificate+of+employmentPDF 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_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 17148 bytes
SHA-256: 94cf672e2a61162f425f91f7bf49175e9b05c7260252f1ddf20ea88bbed647e0
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 10760 bytes
SHA-256: 45ef2286d685c88ca8133d92ca0e65eb5b4434aa72cfcd24ebc3ca19afd55640

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