Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba3408e3f0f3bc2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 01:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0cb71cca71d568e98114cd42d3345f76 SHA-1: 124677952014c57d8e630b52e158df2989e3d1d3 SHA-256: 0ba3408e3f0f3bc2b2f8f2849c9b395ab9f4e0d2ec75ec17d387cbe641f2710e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDFs. This behavior is characteristic of a link farm used to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2216f43a64---sesox.pdf In PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/edg1nu1kh9tb095jqibrsk04c9/tifaxabegudenuxexul.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd07c9ae51---xirutoduledopex.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611060a5b957d---wutusebasowale.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/79472231010.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/zewesezo.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/jajepemogixozefi.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/40893281505.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0879f8641e0efba96baa85f2f09e311e/rimazixisugibev.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd501321e5b---dotano.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161224b37ca283---pijagazanata.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6167e039b2---rodikekuz.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/82891279271.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8cc5c6f2---forojatu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/99630699615.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/tc9ia5r5fq6e5p4jmpc6oi7eem/zidowirugodebezuzutib.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/xegakedi.pdfIn PDF document text
    • https://esz.jp/img/editor/files/30406662619.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/27125440139.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/metipasizotajudadaw.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/waziwokimexofozusox.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/nanubexidet.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/jejedixup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=oman+trekking+map+pdfPDF 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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 10624 bytes
SHA-256: e797283a900f9ff2aecae10fe3ee0cc7350c27bdf87311df727077145ba21a8d
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 18464 bytes
SHA-256: 46a441e2d167c0754cbe6330a6bc0715c130a0f66ffcd7187d4c1cccc8abb544
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1