Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccabb5c0cd1ac63b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 09:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc0544b9be6d9eeaa2987ba4c263c27d SHA-1: 853796219654b367e77f5e393f2cb4c931af9799 SHA-256: ccabb5c0cd1ac63bdfc28e9c7c9d3250f2c485a0bd1918f8d300c55fd49a08a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://abwnickersonplaza.com/uploads/files/37338302878.pdf In PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tebamivugoleva.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109140845292468.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/23934a81eb7404f52e4e029fe80415fb/bogig.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff24ac2920---nilaputitunevalemida.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/fikonesowof.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/85066687614.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/64245952135.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/58740084219.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/266374776425e274c389cd26cf3f327f/wipezejunonagifujisinof.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e734d9907---66175091534.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/zotuxirosufijix.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/91376451659.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905144728760064.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/92904893023.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/69279076055.pdfIn PDF document text
    • https://www.znackakvality.info/files/68318399500.pdfIn PDF document text
    • http://signauction.net/userfiles/file/59462222165.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/91869466308.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/53419145848.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zejitikiwar.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fasukufiku.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/40211941621.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c2bbb3560b2fc3940f61bdb662fdd60c/ximezolimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=private+dns+android+9PDF 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_off0000b0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 10432 bytes
SHA-256: 90d7a61027a3e9b8808c4aa3dd658743fa6f98192c8f15d565f2f7badbb04daf
font_01_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 15180 bytes
SHA-256: 2181c995bd5a14148084511807940885ba1da9aa1fed4dd9b645d6e41d168f79