Malicious PDF — malware analysis report

Static analysis result for SHA-256 458b3d2c513b97a9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 19:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0af769ad87307477fd0bf5a455bc8ef5 SHA-1: 3a3683286d4df6d5cc055c8b77b63c3f23ae4351 SHA-256: 458b3d2c513b97a9668a54a3b46074e1c963a75e7068308165d7d9e023f8c0dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristic analysis indicates the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=hydrologic+equation+pdf PDF link annotation
    • https://poolpoint.be/uploads/file/nojuvavoxij.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01d19dc36---wanepaxaxuw.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/wobofijotabepi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/22760801026.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210619035122160.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/46418680931.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vitoxesur.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/redomopik.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5495c366---21180338360.pdfIn PDF document text
    • http://sentralperdana.com/file/28714384761.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/74051962891.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f10245157---sixetidodawuxepazagumel.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/82595981782.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/esq95ilgpbpn5rhk5g8c808n0r/87310182854.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16076830314e9a---4277600493.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/voxovefumoxiritotewiwotu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/533914cd91b9efbb75a35f12d94ab470/nijekezazigekisivegem.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69074c343b---35992114813.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/daguvog.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/rajopokutuz.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/92e4a7d54c80414159a5df46ff50304c/jixobarotexigakowalagamex.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/95319550886.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/gamaduvobeb.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/bulagivofogovola.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_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 17708 bytes
SHA-256: 79b2e2be9ed5c1b5c1394696cef3a7ec693993fd5ce7f4e993aa97d2ed88ecae
font_01_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 10976 bytes
SHA-256: 5f679b14666d60d07533996d8840da5321b799bb1ba9dbb5274af7bbeeb6dd6d
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1