Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ac31a5d1f1f124…

MALICIOUS

PDF

69.5 KB Created: 2021-07-06 21:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf87eb8bf7b222dcf8a3f1dc36247280 SHA-1: 949fad6e57d72defce5f43481908f00f5289a18e SHA-256: 88ac31a5d1f1f124ae0680c0c14de91bf6992a1f7ab631bd798b784cfa54dcb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The document also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://travelsafeway.com/userfiles/file/rotodonokaxidojabisefegu.pdf In PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/bulujopodakokox.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d72ebb5abe99f27d58bb028613130d25/31704751453.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vinok.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/73565034068.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b19032da20---vazugusebojugodiletisat.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/778539220c899ddebc5baab5d8101010/mejowipiduviwolofebab.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/663f87a63440f3fb087ec3b360caeacc/94404307152.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/6214064744.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/97730197200.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/danofenobadilelajiguxovow.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c242661b588---92393568688.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/48035552187.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a00cf048e5d15f1e3d934975412af6b4/68012199330.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4b7f8aecca9186a0a51652f4b49562d3/pevadogetikal.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/70472104082.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/34665176c537d06c74364e274b452efb/78204355188.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481515e39d---wudusasixalovazuf.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bhcfl4ua3jridmh76v6m17ig2c/24383642146.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087011ea5e84---62045255349.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22c13df1e---6211705898.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b53dd80fb6e---suvipomubuvifijapafu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/i2bn5ofd9irlps3os0na9ucaot/xonojalajoket.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/xevojulumewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=20+foot+pounds+to+nmPDF 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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 10372 bytes
SHA-256: 8fe01c6f82cc98958151fe9aba5f7a4564da21c29adb7d128d8e03b940633b8d
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 14760 bytes
SHA-256: d61c94ea68d7b1759f5dcf6a2e01c45b93fd5614a00ec8f7cc8ecd8712040c44
font_02_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1