Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a597b27d109111…

MALICIOUS

PDF

100.0 KB Created: 2021-08-15 05:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ea725c1ef8aa044363c49fa01fee8242 SHA-1: 4c7447420a7547f7d7c44f8f3fb0ff1ba4afc156 SHA-256: f7a597b27d109111f71bb73e7eb3225b41c1056fe71ce66e8c9232e9588350b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://vagtteam.com/userfiles/Files/48319722454.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160efd3c5ef679---rixoxe.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9rdcs14okdhu0j5r77kitsppjk/wadikegexolopivef.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/62047729611.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/jutolesawuvapewuzirisol.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bafudosogaval.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/9nv78gi010aa9hrpqnq4g9ja5a/nafudatorimenud.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/keruwovolalarojabuwuwob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/marevarorasobaxi.pdfIn PDF document text
    • http://polipack.ru/content/file/wuxogigetonovonovowibu.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/xuzusi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f40a5e4852a---18464250014.pdfIn PDF document text
    • http://signauction.net/userfiles/file/bidogejojobez.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fccad2898ba---kanerivofiditadonidim.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074af49b6639---jakosuke.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/lilupamobunene.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/nusafuwulonuze.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/nelop.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/eecaf319b1a48003ff6732523ffd26f9/73228802030.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/j2n6slp7lv7h0qkm20k4tii454/17680299745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=civ+6+multiplayer+rulesetsPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/farubefowox.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_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 18960 bytes
SHA-256: af947f4845bd6baed7c571edbb20191ba7020fd436ceb98617073fa4ef4ed932
font_01_sfnt_off00015139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 10668 bytes
SHA-256: 58568820afc3850329af400c33ad4af966b25e01dab48595af7c24a869f9dfbe
font_02_sfnt_off000169c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1