Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a253277eed98c8c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-22 01:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ddc1febafcbe5f583f9f0681dd7e84c SHA-1: 94565ef03d4956d9a794f7b6261476592cdc5204 SHA-256: 7a253277eed98c8c13833ee47f184505d9a8af411b497f1338d4d1c60d174788
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://starringthestricklers.com/clients/2/2b/2b6f34f03d9ccbd43d04a050b3ab825e/File/1366523547.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6494725172462b930b9db52b78743a47/posufumize.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955b3e4eb---81845785781.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2a136abc7---96934186301.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee45f36572---vadazo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c553ca70a5---pimez.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/amb14r7lpkk5a12ftide0ldlg7/73496524539.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160945cc004437---78909115161.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad52746820---lezijudoxobewabab.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf5e2aa66---wuxazugaguwesajabo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083560338d63---vuvorajogozem.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a058005d2---niwokejadivigivejijub.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/33340b9e47bd4c6669cc6fa9926e734d/ruzaziriziregalenagelixim.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/zolino.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5e0c81263e5f649ef28cc974eb7d2625/88193583525.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/98546303932.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vakovopufikujinux.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/37kfii5buec2ar9esdgsnqdngu/27156059744.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa8d4808---58747549483.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/48317009393.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c72e6e096ef---fedepobipiteba.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/goripofewimidubute.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c5d9a36b1de2ab09f0371e6c0c7a9f6e/33736430445.pdfIn PDF document text
    • https://cristalensi.com/public/File/22275104183.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbd54a641---52513456019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=30+days+to+the+toeic+test+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 10780 bytes
SHA-256: ea5d3e347b00c9d5fe619fa9dda3eee4c915aa09c66c43169673356cc770f3ef
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 2868 bytes
SHA-256: 8c1529da9f21047c6b7bf05bc2b10afc5f8d18f74ab9ccc8dc02cef6fc52e3b1
font_02_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 25448 bytes
SHA-256: fa43c8ba2df4fa82adc5f69cb11ca9870a1de1ff0cd3e0188188905a7d2ff852
font_03_sfnt_off00013a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1