Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8515483780a9db9…

MALICIOUS

PDF

102.2 KB Created: 2021-07-15 12:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f3c79dff5630777756177cc3df463e5f SHA-1: b23126d9bd6aec65f92c8c52c2d0860281b21482 SHA-256: b8515483780a9db99c8dabb50d089aba35f5a6593e105699ba40f9d8fe9e4d78
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c209a918b7---morazejumumofe.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2846e97a4c46e3707f9e1535f4c0f359/30895136365.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/sidiperewuwatipeza.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5807bded68cbcac7595e7cdc4784ee2b/34817832141.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/nutafozimevunike.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/75185528766.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dfif5ikv2cruj9c8b91g1dpe5v/tadobamelazijuti.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1b709b819205d00d35c353455e7ffd38/vogil.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b111ac5e3---tuvenunumufoxefubo.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837386d9e0e---subiwijefu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/71c27cc3568aa1dcc9985b3ff96abb09/81071442000.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/vipudipeberajuxij.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946bbd10796---18371334216.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b7c5f17e494bce29cb11b6ce16eaa2f/vanepofoxokukuzolutezaj.pdfIn PDF document text
    • https://brod-plovdiv.com/images/jabejatodu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609effbec0d54---69811043370.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/46434197184.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/43afee1fa28cb3a7f70f5410866b987e/46279521922.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca43270ffc---fegos.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0cghrbrjsbja7mq2n0a96narpt/zabefonefexililukemewanu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s016kkkjtvf2tpjcrkavcenuhe/gutopenoto.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/xiwoxikewawafofi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/172b106f6b3131501af67c779700f278/vepumobaket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+can+i+tell+if+salmon+is+donePDF link annotation
    • 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_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 10616 bytes
SHA-256: c1e964959669ab158a5bee2acd634feb776cf36da949738134f21e5d412d8f86
font_01_sfnt_off00014563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14563 17880 bytes
SHA-256: a8aaf5432a2c9f8c58cb2a5b97ce1242d69f27cd3cf411ccbe4597a94e00fee7
font_02_sfnt_off00017393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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