Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06c578676f28e5d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 13:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47d68456e490bd6492832b2ebb3c25f3 SHA-1: d0ad40b0d370a5626d2aaed1c98100de376aa264 SHA-256: f06c578676f28e5d7e08e8d690f9da79c7ca9b907d9cf5ce32cbaaa7119ef348
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These link farms are a common tactic to distribute phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/95881198047.pdf In PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/moxitukuvopajo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb604f0eb0---95456133481.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/pegef.pdfIn PDF document text
    • http://cga82.com/admin/File/5708716914.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108310250527987.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/20670352947.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/10631332102.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb29426b3---31717055092.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e543cae1c---26702050337.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/845095df27ba1813347c635fe690f272/fukimotuxubik.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4fdccc94c---649891728.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/gidumitupamitig.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/fabefevefodewosifofe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113fa5ed3a76---16482601453.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/10228237711.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lumusodutaxosete.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nisuwured.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/sabififiweletorix.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844927d85de---55390834080.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/86948710877.pdfIn PDF document text
    • https://sealskinz.ru/files/file/sawirumoruwetorubi.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e0a5545a73af1325f7bce2b629cb8db7/84515555941.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vumopokulanuruxopopewotif.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada82858b2e---97642825645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ad%26d+dungeoneer%27s+survival+guide+pdf+downloadPDF 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_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 9192 bytes
SHA-256: cec472d94eb3fdb0df358ebc6477a54accfbb063ec4a1f62a798cb8c4131dde5
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 17564 bytes
SHA-256: a04db3ace4784c280b71a1167934ed4feb8a0601851b373cf86ff58a1a6c2b75