Malicious PDF — malware analysis report

Static analysis result for SHA-256 b342740ef62c5310…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 07:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56ac2578dccc20b6a8ae95b715074632 SHA-1: 3a8ad68c545537bf1c2f5e44d910506ea0ad2e31 SHA-256: b342740ef62c5310ef44d645a71b744da7990f340aa978249fb7c5911359539d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=poesie+del+disamore+pavese+pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf533a5999---69450379565.pdf
    • http://hysansam.com/fckeditor/userfiles/image/lufofimebixulaju.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/189e835ebe35e0b5e2b98aa00f420110/wizoxetidalipavupimedeviv.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/61f9329294cd79b26d88102e5a24843c/18023414876.pdf
    • https://hizlipin.com/calisma2/files/uploads/tarenewalubewekaxupeka.pdf
    • http://wumag.pl/userfiles/file/gokifij.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490efac0d0---galoluvose.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2bc748a5aa6c065abc5e920f61ef681b/28125939691.pdf
    • https://termofriz.rs/files/gojemukezevuro.pdf
    • http://bestorkate.com/uploads/ckeditor/files/27816689166.pdf
    • https://chsins.tw/uploads//files/202108090841274417.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/85242032936.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/1ir0cmp6v4cvdn9dukmr47b2r8/tetavuxisuzusajapoge.pdf
    • http://www.pattyn360.com/upload/forum/files/68430325803.pdf
    • https://uleiuri.ro/userfiles/file/kiwovemesilifi.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/75e339876be099b55372eb9db4f390c2/14063126231.pdf
    • https://weeb.nu/userfiles/file/zalositagowifun.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/60961041592.pdf
    • https://hkparkkonutlari.com/image/files/44115612722.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf38c1beb---67993349354.pdf
    • http://servicedental.it/userfiles/files/niwalabozozanumozuvoki.pdf
    • 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_off0000e45b.bin
491078ff09a545ab1609f0aabb7247e09cb8c83f2b50e14e923d65d477573ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 10524 bytes
font_01_sfnt_off0000fc59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 16792 bytes
font_02_sfnt_off0001146b.bin
1fd9be33a2f45185cd7e80d9cb355c6931f497c934cfb962a9f3fd005151934a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 17364 bytes