Malicious PDF — malware analysis report

Static analysis result for SHA-256 e914852e75ffc7a7…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 15:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0195e68349e2aeec82dbfe6e69e3e2 SHA-1: 83476c8650b8c950cb89be46ea6c2173f5a01dbc SHA-256: e914852e75ffc7a7c56fb066f56f0a15bef9dc44d7460f705135344ad8eabef6
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. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fdd69e975---6333832536.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a99541380d8364fbdd533e2bf963ce83/61776249644.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f31f422b---60210458635.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0811b32bb---nonezivajifokaxax.pdf
    • http://mintaialuminum.com/d/files/lumujalit.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4p5g8ojjej2qj7oma94igfglv1/14230396875.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0276f62912da40744205d56b8a1e158a/64771241652.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7635e270---1938560969.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86de4847d---31288903460.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079a62b5dce6---kisifubobiroropelo.pdf
    • http://uk-finansist.ru/userfiles/file/lulijakoloxivakan.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2333ab892---52158528864.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55901c623---sewifugakasubinunatunazo.pdf
    • https://ferdavagnar.is/images/fck/file/difinijilaz.pdf
    • http://afghansolar.com/userfiles/file/lejap.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/09501ac25925e7c2193bc4682368b817/59498263096.pdf
    • http://beulahcooleycollection.com/clients/870349/File/zajaxujetesixivosupod.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aaa91ab4b---23088031242.pdf
    • http://buren-kompanie.de/userfiles/files/ratov.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d005799ad4a---91221099476.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/019c9dcf89d79a9f2cf39e031aca4988/nikoxetedugiwajasi.pdf
    • http://diclenakliyat.com/userfiles/file/bigelo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/78d43adf3fa88dc478df28e03f34cb93/velalinapuwejasav.pdf
    • https://aydin-elektrik.com/resimler/files/jozoxafaduka.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/99955358318.pdf
    • https://girl0229960192.com/upload/users/files/jotikeru.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/51312490573.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+convert+a+pdf+to+a+powerpoint+presentation
    • 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_off0000ef40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
font_01_sfnt_off00010757.bin
554d4809c4bf3f8db9c16738f6739416869178709353730e111549a025ec4423
pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10924 bytes
font_02_sfnt_off000120d1.bin
720a74f8b7ebcc17ab004e85808fc1df515201ff7273eb352257e0ea7c971e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16892 bytes