Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae869b41b9b554f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 01:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5a036c0b32b52d1c4b0653ba9309cef3 SHA-1: 40504738f56c38e5faf87fb253a1d275187573b2 SHA-256: 8ae869b41b9b554fe39df942da1c9c70709d67854c8c1e388ada62516937ff8d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many external URIs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ada21713e0328019a663bf73e5c025aa/pasuvakadakunidav.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/pokojoxawawajijoj.pdfIn PDF document text
    • http://strandedtattoo.net/file/48580159601.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6ef344e827ba5b8348d6674861bb1c2/30411064691.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/59ajv3vnp47ob2ile0hp3j5pu5/84455001736.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/370be3a9c5e35a3b8dff3fd185a89c7e/zarelemesa.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/desewutawokobukikujav.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ed74d83e809030fdae07c92ba2b75644/7976468465.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082c42bafbf1---78093625826.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160922044b56d1---luxezap.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/17680074968.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1eb1568021535a62401e3a1b3ca44346/vusiwomupenalogubumedul.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/27eb04011d6c9c01af00dee683241cd1/wexanotukajenibuwajogisen.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce260801b---81247417084.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58c705295e---puganan.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/tukariloduku.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823b9d6b5cc---3956271680.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/11416730071.pdfIn PDF document text
    • http://mesterek.net/tmp/wufoxulebiguxubuzodatowa.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/db0f3b3b496db05e663b8b65e9f59570/wemapek.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c928848a8e---jozanilopewumiviboka.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a12cc7d95d2---32622654292.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65cc808d7---26803733098.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/163921095560a024571fd01.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+recover+gallery+photos+after+factory+resetPDF 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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 10820 bytes
SHA-256: cd5ec555808a6f9cf80badde55edb188c274362c9e24973488b7ecb1dc66203d
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 16860 bytes
SHA-256: 020df7a9337bddba322155c20f1a0abf5f4f726b0449a1f46658420b8c244a6f