Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d53b93ed22966b…

MALICIOUS

PDF

129.9 KB Created: 2021-09-05 06:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f99924e0f6871ad0c6d2a1551594d955 SHA-1: 95bba088b257fd6de9b656c26a9fea13454a6cbf SHA-256: b5d53b93ed22966b45a50b97f5432e974db0a30398cd342602ae1977b684e7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877bbe33625---fufuzolegodaratinefaw.pdf In PDF document text
    • http://gps-tw.com/CKEdit/upload/files/55279459809.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/8242655177.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/51169310664.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/lazirukifexigexewalo.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/difudebisifudijep.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/34327168212.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gf0c07glqjngejnopjisbulag5/85516211116.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4005924b---nukamuzawojer.pdfIn PDF document text
    • https://coil.hk/upload/files/28644983200.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210810_031430.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077112789325---joxaxid.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/sosafefutoleraw.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210603233459.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/33974868733.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e1b3a4e8---71807085439.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/92kv23ideiu2icuq0urqhd8005/nuzibasosorevonawelaxidu.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/pavik.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/25050942233.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/2955537503.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/11159878339.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b7fd119a57abe81f570a4aef23c1e642/36199664389.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/34563864082.pdfIn PDF document text
    • http://chinalabware.es/d/files/gavigijawanajuzulexix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=analog+filters+design+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F47 22328 bytes
SHA-256: 0c021166dab78bd8c54de0aed591b4cd3f4c7c418a4299327f3329daebe3cc13
font_01_sfnt_off0001c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E19B 10656 bytes
SHA-256: 4d2ab1c763bbd41e383ff44e00afd0a4ebc66a99223de28099c363a5472cfbce