Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b53f1c0a6196446…

MALICIOUS

PDF

72.6 KB Created: 2021-06-25 19:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95cbcf1b6ab47c3a26357d8a39374157 SHA-1: 7031e4bca8d947740c526d16e0b1afe2c9106462 SHA-256: 6b53f1c0a6196446f3c9088903ddd4de354fb4c335b2ab011151dae8ffc61ca5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3468ee9b3d---kepaxajofasazoge.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/677acae50126c27a5c9feb62cd6cf3f3/turubaf.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/knag2a96iq5htit9ttsboo2a85/monedipi.pdf
    • http://botosani.ro/img/uploads/file/bagowimikubovibusexavasi.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fbl20hktb0qumi70038nlqf8to/34698142218.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d7de3ca7d9849472418747dbbcd0ac8e/tibuwijerokebuki.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63d6a337---mepam.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e2f0ef6010b0edb5b63395951dcb4c5b/mipiliwexavifafusatokuf.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/209n16l6l3odrd8hntk2as9rfs/4970738739.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6952439ec756801c7ff30e6fd7dff049/sijonuwukowopexede.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pjh6trtdnkn022r5rq4pf3v249/nuwaduzovafu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e8601398963d4305f723245748b9d16b/67658167190.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/cd513ba5173f110a445524a5ed63c621/39752785025.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ponetalumudaninar.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ba2415f8---ziravatuzutitaxajez.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fa633dd418545c6dfaf712419ca6b023/vozugeziduje.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160719b38a0696---20440779481.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/12720919584.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9ad6ee51---pojoluran.pdf
    • https://oteaexpert.fr/cite_imgs/file/kavivupipelux.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608167336d2db---ganukejaxejeju.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sonomawoxuvimejerex.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2c99f470---68785622533.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ad741d3dac923dcb41fca3f7b1c780d6/kekigurevagesawagedip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=a+tip+meaning
    • 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_off0000be2c.bin
a10b8c734f4092a4eb7ce95d04b336fe12f97fa044b1139a80f8219822104255
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 10140 bytes
font_01_sfnt_off0000d4cc.bin
2ec1f8a3493c9d9a6e06639e44541a63a343886041e630dc1e4c0f787c649dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 15748 bytes
font_02_sfnt_off0000fd5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 16792 bytes