Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec75b38d2ce632a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 22:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a561bb4fd558853719c154091f02f49 SHA-1: 9f39c8c2a893f007e64cee23b085b5efbc5d4fc1 SHA-256: bec75b38d2ce632a5270b3abaea9c8353384edf238e1b58f2fd4e82957e2c022
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e21ab285d---wevokovezaxagobezisa.pdf In PDF document text
    • https://hijaulumut.com/contents//files/44433485714.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tejazisolot.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/65064964101.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gofewubowadunew.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa680b703d7---13186417304.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/53033298023.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/28342107148.pdfIn PDF document text
    • https://parkettworld.com/upload/files/vilegasaxokuganibodudu.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/danazevoxagasotogejide.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9800960b65---tizufaxi.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/40867891397.pdfIn PDF document text
    • https://dm288.com/slicice/file/vesut.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cb3956fd15533b4705a841a2830ab480/14698563781.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a13aec5658f---65442777092.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9fa4f2c982f232b7a438f953877781ca/38044643469.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f244751644---lidipexagox.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/sufobejuzoloxejej.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/22861063710.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/fokalufubi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160924a1aad568---zixuwojumifaxubabobuku.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tuvawososofedaro.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160846c7b6e747---25199865124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=here+to+nycPDF 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_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 9860 bytes
SHA-256: 4b6c48a2f519f46d64e0e792c8f2d28ac12c2d92fe02fdb8e528567be3642d81
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 17964 bytes
SHA-256: b684cf4e6db57ecfc0a6fa3ff88c2b11ab4554fb693583b91ed0ec2d71a34330