Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4e8929e364bab4…

MALICIOUS

PDF

94.5 KB Created: 2021-07-28 02:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b98fcd70978f0c84bfa915a5401bb3dc SHA-1: 399cf1dc9ed7c6da48152e9bead6a5a258da09fc SHA-256: bb4e8929e364bab44b77cbbb1f087c492b02b53062ddeab13d7a55c309761993
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to host or redirect to malicious payloads. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nuttydog.hu/ckfinder/userfiles/files/73654963456.pdf In PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/3037764290.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/30253168053.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/lilanuzaguxotezubibit.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/83296847415.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ntmevm6doefa2p5uuo1aub0kss/berakoza.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/rutaramamuput.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c245055e1---64860377956.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ab1g3n47llai8op75oldua7q95/56163361274.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21261a5397---lagezupex.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/gifurefeloviragaziguzovib.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ne9i3015huiaf0s01bjpafhvss/tabuxinadeb.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/61450601359.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/412f777334ba6f42664fdcd3492764bd/98107218902.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89660191e8---buzesazi.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/49551296576.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/xisuson.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapofawuzevobidaw.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bapipizudufisorujawe.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pegewetijemujoxufopuz.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/56759824131.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/relomozerubuwipatesar.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efaf1a7b6---25780290307.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944db782529---suvuguweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=anatomy+coloring+book+answer+keyPDF 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_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 18116 bytes
SHA-256: 8db8a71818b73f4474b094ce89c2dc847f4f8d3d922b7b4e90d24052b0200563
font_01_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 10984 bytes
SHA-256: 61ef455573e434fd940333be7ce8500e7fc368ae7cc6d23b1972bc86742b22e0
font_02_sfnt_off0001532b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1532B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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