Malicious PDF — malware analysis report

Static analysis result for SHA-256 434f5c984d162ca7…

MALICIOUS

PDF

68.8 KB Created: 2021-09-03 03:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd8f83f96019f5b6a800ae09b65df967 SHA-1: 33465f8f632757175c1da78a61f7ef70be938168 SHA-256: 434f5c984d162ca71834e96c7bb657223922fcd5fd747a49ee2ecb68e496abad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on potentially compromised or disposable hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c4bd80c8---94520093933.pdf In PDF document text
    • http://fatamorgana.fr/uploads/assets/file/90309405406.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/72452672241.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/dujolapudukisadal.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f61aac5f59a5642a70f622ebd9ece2b4/satovosebuzumodepito.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/dc51f050c2a076ea9d317d6635273b4f/61917075740.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/kegol.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/84352094976.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/52987325927.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/wedasujuxakozuw.pdfIn PDF document text
    • http://jainfarms.com/uploads/26888067492.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xugevigejutilo.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xitenefex.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26c430b21d1a355ad88c1d669f0bb121/28354777582.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/lokedasisu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69b32a7e5---85968960068.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/d60cuvv7jopm3tam2sqihujle8/38255905944.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/44250786681.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/duwukekakuzar.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/xitumod.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/58017886750.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cee7eda46---16804204763.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/zamadopeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=insurance+claim+procedure+manualPDF 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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 14412 bytes
SHA-256: f4090a4ddfc7d8f17eb8cc677ab0c88f43df26f5afb993113d6224f569431cb6
font_01_sfnt_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 10628 bytes
SHA-256: 26227d5f600ee4191a610a5c542605458fe774de10f518d1342bedfe477a30e6
font_02_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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