Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ecefd52f452ae8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 22:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f4cc1bafb8f3c7803948e21c64d14fb SHA-1: ade6b5a3f70bb6b56bf8e5060cd66b280c4352b0 SHA-256: f7ecefd52f452ae80526283585944826a0a92447731399ed1a8381a9353d00ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=android+messages+dark+mode+missing PDF link annotation
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/tigubomugasotig.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/11820831834.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/86251692097.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1632442185.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905220857.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/70827052370.pdfIn PDF document text
    • http://enewind.com/pliki/file/nesita.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/sukovedulon.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161324c9bebebb---gulukisekuvumed.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/fopazuwemiwebojoburovifod.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161452f59d17d1---pasogoduroma.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/muvunonefareridom.pdfIn PDF document text
    • http://candientushinko.com/images/file/kawozuvaf.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/zekutafatadil.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/82c5c818076b9a5304097e697ea53b7d/jubujefumanabesigekigo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/53114327092.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0c769658c---wegorebozepiraremed.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/rexudusig.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/92967672865.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/wedawebewoxamumin.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/63886080226.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lusuloniselu.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xerureki.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149abafbfa54---76572752068.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_off0000b6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BF 10520 bytes
SHA-256: 84d83660890ddc63cb926c11ebcb783b3550e1ff5317e3c68aff5424361d7b36
font_01_sfnt_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 17456 bytes
SHA-256: fa5e9e49137ca95cc6d79986daba19996f1b94acbd5446005a5a40466f4622fc

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