Malicious PDF — malware analysis report

Static analysis result for SHA-256 4070e135e42ebf24…

MALICIOUS

PDF

77.6 KB Created: 2021-07-21 17:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 225ace62b6cb7a546c9b0abf6c164526 SHA-1: 0c8183e6b73f980f811242d00596073922e987e9 SHA-256: 4070e135e42ebf248ac3b37fce8a9bf0c4b1ee02cc66a6c55923c5da8f556b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The PDF structure itself is also noted as potentially being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://masihpt1.com/contents//files/48483550034.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7010ea91ff61c1751555e557e1f5e2f8/davupeduti.pdf
    • https://mps-india.com/userfiles/files/rerobewopidokixoj.pdf
    • http://xnucleus.com/members//member_images/files/sepogipowuwejofor.pdf
    • http://ngor2-3.com/file_media/file_image/file/30343294441.pdf
    • https://editions-tlp.fr/ckfinder/userfiles/files/tadopupopiwono.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904607bb789---76875243979.pdf
    • http://alituncer.com/userfiles/file/sepovuwevomisok.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210719_0C722455E429A154.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0130a3a5c1f3af2544de146e7fc0f162/pasofijojinikukixoku.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bab49f8f4---72624506991.pdf
    • http://hzzxtl.com/UploadFile/file/20210629172633581.pdf
    • http://ciarajewellery.com/editor_upload/file/gazujobojaboto.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609899c075222---namumozididaletomijiruwep.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/494b09990d4b2c6674575cdcdbda9329/72236887394.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f8a071faa7652dc98d72bfb6782339df/53418922594.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3369b1d508---59201644779.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5d8328d8c---49463269742.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b4420effc736706bdeb5f0e97969babe/nelijogumodemutuw.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160785b7231fea---kilujuzejaz.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a477a866bc8---30924128999.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=isa+pa+with+feelings+free+full+movie
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/df1e9bc7cadf3de185adbcb9b2aa17b7/4854857756.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_off0000cb35.bin
7a217ae73a63d5718996bdcf111656a0d687fcdf029672ffa90e984c8216480a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 16708 bytes
font_01_sfnt_off0000f6e7.bin
3a6072098a0e1b7e1e246138beb1bbde6e57eba2ae70918504858cab92d9890a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 11008 bytes
font_02_sfnt_off00011061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes