Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c643a9b9ada8ab8…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 22:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b8c12fb86f5c773b770a3c8dd25ddd4 SHA-1: 94d8f8a344a5ef8f416d295d2f2d4333f95b6fb9 SHA-256: 7c643a9b9ada8ab8288d7c0b2c5224b59293d16d993a28c31e5e0c24b836074f
96 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier as malicious. It contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. One notable URL is 'https://allytemp.ru/uplcv?utm_term=request+for+part+payment+letter', which appears to be a lure for users to click through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=request+for+part+payment+letter PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/91e2a8f095bfe98253c5359c98ee7aca/rukizonowopisagiso.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/94717181411.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/futesafipunisi.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/99612033078.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/27830487915.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/14086242254.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/lodinukilivexubomat.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nebewijagevuramu.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/6425685811.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/86579016514.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/mexiwinometefur.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/31184485192.pdfIn PDF document text
    • https://aksusu.com/upload/files/78038651809.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/vapesaliwexabiwujavawiji.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/vokigo.pdfIn PDF document text
    • http://yongqingtech.com/d/files/fipijunijalujufo.pdfIn PDF document text
    • https://12waktu.com/contents/files/79704772816.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/melatebazumepajemuvezinu.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/27880849906.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/40082289956.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kk2nkkfol3gcvi46lk74tmcqgq/13761928541.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0bc441dd9---dofozag.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/dadejafu.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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 18120 bytes
SHA-256: e052e1d74c2cbeed4c68415d6e6f475c550325d374d48dc1f0fed0e3b5d50908
font_02_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 10832 bytes
SHA-256: 8a21b5754614c73dd7c5c70054d9f9dee7b8c06a23823c852502fa36029051b7