Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e74307d38bf7a9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 05:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 838ddd2e8d200e364b7674eae391da03 SHA-1: 34690b5a71d787cb899867ddb3d05048d334a155 SHA-256: a4e74307d38bf7a94b2c94507d731aac3a9063ac4a1b9a74a727b1374205243d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple external links points to an attempt to lure the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://micronforgacsolo.hu/UserFiles/file/89214598011.pdf In PDF document text
    • http://hightopeducation.com/cms_uploaded/file/desolovizinewunatubonus.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/xomabufagupiw.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/tukopovopale.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/72737559417.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9b8fde08f8e8804ae7afab530ec67078/46765693429.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eda8c53eb---xonezefapijopawajobi.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/93472281238.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/80611480766.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/63881236749.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/konixixox.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/21905629880.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/49591865689.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/vonedevubotipor.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/41213883699.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/veguxitepotasemurenije.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/rijifawiw.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/misijefajawuludozudolud.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/varuromemirejagawojuxun.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/daxixug.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614699eb4a7f7---87073230322.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/kexexori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=horse+haven+world+adventures+apkPDF 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_off0000d1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E5 10732 bytes
SHA-256: c3273aa8afd05289b8950b1da0fbc94025221cb856cb00c89844778d5b30d105
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16944 bytes
SHA-256: 2aa78daabb62bd6c57cb45fedcb3897f68cbda4c5fcb54212a5882f17d3a542f
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1