Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ecc18f066fc877…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 20:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62efa159779dd33ead2ef652b2615ab0 SHA-1: 49c766a468d3377157b93e5e344c4ff49e22223c SHA-256: 35ecc18f066fc877b07d8ac897a4f073a795eeea0cba43b9ede35942e44d63c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised CMS upload directories. The presence of 'utm_term' parameters suggests these links are intended to lure users into clicking, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=interpretative+phenomenological+analysis+pdf PDF link annotation
    • https://readandenjoy.ae/userfiles/files/24892823201.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f80f3ce5db68c7026348c48ea93a09c9/tedomoditaleluwerax.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/lodojafamekawujenoxap.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c484a334688---wozasavugugipinu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/fetererumi.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/6575292198.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/jalulosasa.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a572418cf47---79961132113.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/kabuvarirerefevefal.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/manorovorujijoputap.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/26186227688.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160868eaeb8828---9793533926.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/sduh7imcg0pomp7vpk9mad91e5/nenedasitekofuxobo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a62736f2ce3a14ab68f57e50daa298ef/gekamopodajugabufivuguri.pdfIn PDF document text
    • http://yilip.net/userData/board/file/27175052787.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/mupelomopugurafemifirajov.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/mufulawipawimukodulasan.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d0aae54ed23df4b5964b131a6447cf51/turipiwudakuzogokadeba.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/96164853269.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/74065791872.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/aemu2vn0tl7uuch1n8mb1j5sfl/vugogo.pdfIn PDF document text
    • https://armenia4d.com/contents/files/97620768247.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f694be018---37984647273.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/383444aac87c5f3c8024360585904953/23136144826.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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 17868 bytes
SHA-256: 27b7dfbbc61444bbc4404573c117fdbd0b1963c07b8da09acdc10723ce61825a
font_01_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 11196 bytes
SHA-256: 4ed0186e8166a4ff65874da48f4be3e7434bfea562f48cae4e849301f7577b05
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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