Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeda241dd5a2a8f…

MALICIOUS

PDF

87.9 KB Created: 2021-08-02 00:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 281079e761e6f44dfc8cc5da6f7d7972 SHA-1: c5914af31caf03e1f832db7113bb25a582cc71b4 SHA-256: efeda241dd5a2a8f095842f077ee281be9d09ba05de14459c6a5125005d52ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The PDF structure itself is also noted as potentially compromised, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://laborke.ru/uplcv?utm_term=why+won%27t+my+aerial+extension+work PDF link annotation
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8097f7892bc82d7da84b4d9d25d4b45/16477169690.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pujotu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/33505195848.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgtrce61i48h5vcopa8p8f4sq0/20414267120.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/jeritunikoka.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160952bd3a3546---voxowopedetir.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4ff05364783a9b6143eb561e567cf7f3/tupuvupikugevaxofulegaf.pdfIn PDF document text
    • https://estoniapools.com/contents//files/gadotatebamuvab.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/94052010263.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3242e48ec---nigapokoxuletinazoluzewa.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/drhrp87ong9kkibh983otvs3ir/13206164888.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/5m608eacpu9jninenmhidn9snr/78365087054.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa8b41276---65839485881.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/xuwitoka.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085fcb943b00---ralimof.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c378eec5---fogugixijejakej.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b65352ce4---15410728328.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/56307025b53490e69d3af0898767301f/340195190.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/60824499003.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf6mo94j2irabpd4q071ino2e6/penarow.pdfIn PDF document text
    • http://mega.kz/media/upload/files/taladabamusimivalib.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/70966249558.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/pexanukimenikatowofa.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/nebagijas.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fb171764b---9169325473.pdfIn PDF document text
    • 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_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16948 bytes
SHA-256: 336fc3aa73fe7b831d104a7e80b917f843ccfefe7a9fcbfaf871f51bdd99df48
font_01_sfnt_off0001210e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210E 10792 bytes
SHA-256: cd73622a568d60a861ce11529f39ae645502d27a6e2f4bec071e7c51d04507a2
font_02_sfnt_off000139d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1