Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd0203523d17bf7…

MALICIOUS

PDF

80.4 KB Created: 2021-10-04 20:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12a86db5642c5a83cd66843d00ca057f SHA-1: 0292aa8e8c489de2046a21182b334ef53d1be658 SHA-256: 3bd0203523d17bf7fdb6aabecd0fb12d02170d33d7b92115afe8520cc1a1fa14
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://netmode.net/app/webroot/uploads/files/lemokanegiwax.pdf In PDF document text
    • https://sushixusa.com/userfiles/files/94922246433.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613582cc682e0---tawunaxatudotamabezaburiz.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/26887658579.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20211004081528.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/52841375840.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/tiwugaliluvabawitizorujir.pdfIn PDF document text
    • http://identik.hu/editor_up/78997845218.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/88388204331.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f187c1ca4d62c94edf85c96854f3159d/binirigola.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332505038f9---kesuxadenagakaja.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/laberelovuvegiwokivad.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wijaroziju.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/65862328914.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/sewebojetiwigonaluxovele.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/wawogewivetusotoxiva.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/92362877405.pdfIn PDF document text
    • https://mimpishio.com/contents/files/niken.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/72139547701.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150d77c5dc7f---nijifazipeb.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/bolurugidujoxibozunakux.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/39917834737.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pu374sun4215j1mstdju603hs7/vuzodiporajeluvasajax.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/49389125053.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/34012362690.pdfIn PDF document text
    • https://filetorme.com/upload/files/14293249046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=weather+in+zion+in+augustPDF 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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 10492 bytes
SHA-256: c6ceec5f5708d99cc9371c570ad48f181b559f76f697e0392a3f921f7e4bd469
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 19660 bytes
SHA-256: 691576a88d566a31ac8dba89ceefcf7a72ee20df4f87fd48b6a655aab5988a03
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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