Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53dd1d1607b7184…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 01:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30023f1ae5cdd7bf45ff00c505da6917 SHA-1: 249927a9152b69a4d4268a900428fa99c966f424 SHA-256: d53dd1d1607b71847a39f2e5f125867ba12387c503f6fabe8dab25694744f7a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is identified as a link farm, with many links pointing to disposable hosting or compromised WordPress sites. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to redirect users to phishing or malware distribution sites. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=android+go+launcher PDF link annotation
    • http://www.farmaciapenil.es/userfiles/files/20118023213.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c44ad94cf50971637ed50dc7f6a0a58a/15644380740.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/tiramiri.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/20580714203.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/70781692120.pdfIn PDF document text
    • http://szwygs.com/upload/rezafavedixosisipeto.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/84389634027.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/deviderutokalow.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210924_181037.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/nuzifosuji.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/83cd14520b64c4afd940bdff9e9d26cc/dolukedovif.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/revokakas.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/56921266586.pdfIn PDF document text
    • http://labradory.pl/file/bazapoxinetafano.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/gegobujaxuve.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615001e3af75a---runerugemiliwej.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xoxesisivew.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/55247751549.pdfIn PDF document text
    • http://home-plast.ru/foto/files/88676495642.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/wudanipuriwepalamobus.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/begese.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/30046177840.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161488fc90f2a8---19020023266.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/wufewakipulalavokegaxet.pdfIn PDF document text
    • 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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 10464 bytes
SHA-256: 419ed43c2d33fd609e52b0feaa58a364034d7369b7243f97c23646c7f3fc5caf
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 14680 bytes
SHA-256: 9f492836eecd471994becbb7f3b75fd01f7818a0e5ff6efc89c64bc7cc842a82

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