Malicious PDF — malware analysis report

Static analysis result for SHA-256 194f7390861208b4…

MALICIOUS

PDF

102.3 KB Created: 2021-07-21 12:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b75dd90d35ade3b5a3f2a03f5ba10f25 SHA-1: ca87e9d8a52b8c5aa0c5a03faaa876c90d8ecdd4 SHA-256: 194f7390861208b4b96a3168e6508d06a6ed4ff969a28a35b6c61b249510d27c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784d8bbcd8d---vezomorudi.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/6t5bsc5pqas719if8lfu7j34od/74550998784.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bc3ba1691b8058091aa3edfc9428c5c2/79504437701.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/genagixiwitagexuf.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/22c850b11c75edbc250577ca1cb64969/vidulafojovixebixit.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/mepipomesuj.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/gavubigubilofujagosobirif.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1e55aa0980694dffe817b52e60068c1c/witawaxuzugagijekofifirag.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/54228319171.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c6dd277b45cdfbd52e08b1f2063fe69/pajinabin.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o98atk54av2q229leiamde5j63/50697328224.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/fukovufopadax.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c62500792---nuxevenukewuvon.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b88cec3d4e3---60418031606.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160944009c62be---xipexexe.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/xomewijawokaxon.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/97ccfa29f77f24354ac925d2b400b2d0/fepagafawemezosu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a44d55c45a---3881399316.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/72357060388.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ac1f54024b4c81308b813badc1b484af/35293428406.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e9fa28146---50999576742.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5d0061dd---zegekasiwagofi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/faa1c44f8c51016c6cbd919e6e7b7207/69834175369.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wosuxoxuzesafugogotisivo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/04d879gt31vl0s893o235g4ia9/11285053020.pdfIn PDF document text
    • http://bwc.lt/i/fololif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=histogram+in+digital+image+processingPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 17300 bytes
SHA-256: 2cfa0dbc85861db7cb2e52dad1a8df25690e754b10b4bce93648759e0bd263b3
font_01_sfnt_off00015a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000172a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172A1 10848 bytes
SHA-256: f6c9d59c142c8cca26175b2cfc23f96f7caa387c835374468a26d84ce52a6c19

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