Malicious PDF — malware analysis report

Static analysis result for SHA-256 2329ea2a52b17a6f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 20:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80ac5ae8f6400f91f903d5156c12dc22 SHA-1: f86f814aabafdb56120ce2ac2a065cf6c3026fb7 SHA-256: 2329ea2a52b17a6f16f6f6e34e2202aad96771f20c870b508c809ce8a10f4040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The document body is unreadable, but the presence of numerous embedded URLs strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baodieptailor.com/uploads/2021-06-26/images/files/nusiri.pdf In PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/96668186618.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/zufozubutabo.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/66493900151.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/jazijatadanag.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/2311094712.pdfIn PDF document text
    • http://4yoga.by/pics/files/16412281596.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/41657390814.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b907445b937---87556033595.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/xodokuwogimizi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6050865634---72281612571.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/senilokufezulex.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d247d1f27---rudalalipavetatanafa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/58316151893.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d387c1a789---65862558606.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/88532738395.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/3323764074.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qpf6fvcdpmcbi74a64gk0lod1i/97473318458.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///22961313209.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d96f252ac---91583152384.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7425ca7c---65682439761.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/zuxunuwotinopinizanu.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210622_1A5581F9912E628B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=whirlpool+wsic+3m27+c+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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10928 bytes
SHA-256: 60959e6eac301aa4e71000eb36223ee3e46e871b29cc7899c95d0739d2c96179
font_02_sfnt_off00011695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 18028 bytes
SHA-256: 268ce1d67147b0c101793755d33286b33e40b3725f2168c1ff817364743337af

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