Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f166f4578061129…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 17:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c84670a9419d7d2a7a8fac36a508b2d4 SHA-1: bf4597f5160718beee3a81878f0b8b0a759d8394 SHA-256: 4f166f45780611299ae88b8b57335f6312c3813e8f45621e96177f476c2125bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://stellarp.com/userfiles/files/jozatipazapalemenaw.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/64310385329.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/6363325267.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/885e051a38d0b32f67d881ee2cb6a80a/20642152363.pdf
    • http://breakevenpoint.pl/uploads/editor/file/rumosebalikatejagaxivufi.pdf
    • http://etoprosto.ru/ckfinder/userfiles/files/wisidepobiwakek.pdf
    • http://aescantabria.es/upload/fckeditor/file///zapef.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/goniwavibifis.pdf
    • http://suriyedostlukdernegi.org/image/files/93317383251.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/giwafodosipezulop.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/1524932973.pdf
    • http://group-anons.ru/userfiles/files/kowomoxesovid.pdf
    • http://velocimapper.com/webfiles/file/korowexeso.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/83069629797.pdf
    • http://fongyoskert.hu/userfiles/files/87428805322.pdf
    • https://mashura.co/userfiles/files/vekijelenudufiv.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61a509b9c---kotovuwokiwoxejimu.pdf
    • http://habibitours.com/ckfinder/userfiles/files/jenuzoxeginusufu.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pedatemumituworibisam.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8ae3d8b43---sorofexo.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139c59f9ab0f---64111170245.pdf
    • https://tivirtual.com/userfiles/file/pijipegoravugovifowofi.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614131399abdd---95890334218.pdf
    • http://hongshengfish.com/uploadfiles/20210922/21092201212233105333vz1y0gbgp8.pdf
    • http://good163.cn/Uploadfiles/files/povaxipaseduvewal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=electromagnetic+spectrum+and+bands
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b52f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 16792 bytes
font_01_sfnt_off0000cd41.bin
2ba2a9bdf9ef060bcf3f13e087eb4bbcb6edcc7365223fea6f3c7107813f54eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 14708 bytes
font_02_sfnt_off0000f1f8.bin
f61a8c281750c01aa68ddb8e1172ffcedcdc86f036fa73f9e2efd894f7218e88
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 11080 bytes