Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a4461384a32545…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 00:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fffd4309efdd1e0a8da4503bd8bc0e0a SHA-1: 11e90861eefd3fbb7af6a9721fbbf672f45775a0 SHA-256: e5a4461384a325453567a1f5e201ed37b44748b45854b821e804e57a0cb7f485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naasschoolofmotoring.com/fckeditor/userfiles/file/ripowufil.pdf In PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/33353869378.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3c98955e---21511905425.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/bexesagijapad.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/97196607551.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/91850066250.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94bb30989---wirufinizinuludiwuvijuji.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/guforotovotamipuk.pdfIn PDF document text
    • http://e-menu.hu/editor_up/losumajixaruf.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/madikudulafakifesuroxi.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18109830180.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/79042852287.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/70726896009.pdfIn PDF document text
    • http://bulmarconsult.com/files/fabipogumixojasojivibunej.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/20839345815.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vudaxikusefaligulif.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/subugegape.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/vodovalakofal.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/27056821208.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/55764149612.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93053974445.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/rarulinejabalokavozufez.pdfIn PDF document text
    • http://snft.ro/media/file/60182080736.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079ff4fd83---wakudarinadofugunogiw.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/57824173434.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1597ae56a432e87a6b0e91befa4f9a38/lipinabum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cannot+run+program+svn+android+studioPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD7 10756 bytes
SHA-256: 074e90fd019b4c31e847ad1a33cae0dca3e736f5e14d272addf7347461b51aa0
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 20928 bytes
SHA-256: ff89bf21873d5ec9c82832ace601acfccd291819f91e2d071c8ac5c7c5f42741
font_02_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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