Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c869168e80628b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 00:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5af934639ee32a7a8dfa56df33ad578c SHA-1: 307a0c58c4fc4495496036574bed0f67d5728043 SHA-256: a7c869168e80628be7162a1adae2f23092b4ba647fbe7a5f66999f6392642e63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious document used as a lure, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612694c18b765---23128468014.pdf In PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/77786035531.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xemewamekubapivirisumozeg.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b69ca22796c7af4cd5a32037aa37df29/71120264062.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8e4df059220b01c1994ceddda460fa77/makifajeputejopefa.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/9788951776.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/64326232989.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/bezikitulomufidamupowana.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fee75eb04630633a5c77cf469cccccbc/44719090483.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/14858887616.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rikukesipisivozoxu.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/wuvaxenidilufexin.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b803819f093---fadofiga.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9d58dd4bd13f0e1def021300b4c4b3c7/kideladazof.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/118449758.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/88294884558.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608696ce03375---lidakojukuworegenim.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a1d2ccaa---xatupewegowozopugokip.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/30610229996.pdfIn PDF document text
    • https://emprenderem.cl/files/21144389278.pdfIn PDF document text
    • http://word.mn/uploads/assets/31510435827.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/dufofuka.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/novojimadobosigibiner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=miller+and+carter+drinks+menu+pdfPDF 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_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 19380 bytes
SHA-256: a390ade75a411a3b633793275b848c33a69f4e210ebd8b22ab8da6d27e57b2e4
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 10848 bytes
SHA-256: 77f517cc0be9694853f2312e951a1c5a2c6a8749b5c75e7bfc90e568e899c574

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