Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08632785e77e1bc…

MALICIOUS

PDF

83.0 KB Created: 2021-07-22 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 37d59cd7c7fb2a5dece8addbeb84d649 SHA-1: 1f0fdba237a3202fb9e77fedc5d91af5314dbeff SHA-256: d08632785e77e1bc5347c30148070a225a490ad22ed1c10b51c3c7889ef891f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2d5c04fababc10ba8ba2906ea09becd1/wuretumegisekugibomex.pdf In PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/81028701986.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9585771df---32054208047.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/jufulokatagopirijab.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/vebonolipifen.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/92941157228.pdfIn PDF document text
    • http://skupka23.ru/upload/m/xeponixirokox.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/40b32e8ee4830810196346a0683c669e/sutulizewamegumidok.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/29090819703.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/60925938311.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d467e9e7---80706214657.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f2702b34f12bf6e6a9d5851144428845/ranaxejufufawifasarojif.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da48f49051d1c0842d2f247054f3b808/kevepupamajomujadijixirem.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fee7db66---dupuridijalenabif.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3568311023.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/99060716231.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc4d85bf8---27236717910.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f69bcd1d---73890355607.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/82812402938.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0152b06a5---77473501312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=please+be+cautiousPDF 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 10260 bytes
SHA-256: 56113af469910e5ec85d34223cb073841e94e0d8119804affd6149622e6ea2e7
font_01_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 17288 bytes
SHA-256: f2fc8eefd961c99c2a27ee3c26b4b2807ec6b24bc77a18e1d11f8d1b11e2c487