Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a15e809f50dbffb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 04:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 056dfa2ce7a39828d12c58fb9d0127f1 SHA-1: a79de41234fc2db97970edc7afc3bb8ed098c09b SHA-256: 3a15e809f50dbffb6ec18b0b3361d1fd830afd53ff4d0aae3b912393286a37d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=alfred+camera+pro+apk+download PDF link annotation
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210925055257.pdfIn PDF document text
    • https://sealskinz.ru/files/file/48601651062.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5afa00ea2581121f8a10f785de33268a/xixafubutakemajilew.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/lanavelabafuviso.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d2cb73c4c4337a56876df6348a7c3d94/48731820259.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/bozogidojomixobu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/wusivawofejapodisoxe.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q3uf1pmg6bpfmpvf5nna9vi2a3/kojudepirupuzapoxokeval.pdfIn PDF document text
    • http://home-plast.ru/foto/files/gaxupitoxozowufawove.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/83166534306.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc480540a7---gutomaribuvunox.pdfIn PDF document text
    • http://altus.pl/userfiles/file/30946249214.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/lekididedufoxenimi.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/juzazadalovadikijenov.pdfIn PDF document text
    • http://npas.ru/pic/file/dulisafinosudawog.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/13627965486.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2ae2d2788---75281226577.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/800842291.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/23550165205.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/70041641031.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/mogosub.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/lovedukixabelomumilani.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210916_060338.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/segoduxipevimube.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/bupevisepoxenew.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_off0000b2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E7 10584 bytes
SHA-256: 0f7ac01f8e2953ac7e9827bf15198e43c10f1d9d6c28e05e42645ba4c2218d5a
font_01_sfnt_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 17096 bytes
SHA-256: ca7aceb4610d0af64f9deee76bb3d3be770d5ea2e260c2ce884ecaa84000cacd
font_02_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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