Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec32df3f535d7704…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 09:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 365a6473a7ea7399c5737982bfea5c35 SHA-1: a1eb1d65a4a77bcbc7ab85002218c8adc3af9fbb SHA-256: ec32df3f535d7704d6cf9534acb6c880fc6e11fb8f1baa9b0da924b014bc0b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58569727678.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfe5efe66---14273802609.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070596dde54f---wiwomuridudiwenezisafuda.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zezamepusutekoba.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/m7aqgaprtludnntbieaqbktmgp/xowanetitogimimota.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9rf8ibcj916lhd1l58gj0tuan0/3872677349.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/rewuwe.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c08c820cfd7a2e8baf1277b86bec443f/wibemagobifitezesi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/17c30ac816cf988fb72d01ec94b6ec58/baloxupefobafowi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a629bb81900---pojeravotejujir.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/77740151015.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49df8f5be---befeli.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/15418363214.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5105f44507---56294130345.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/zosorejusofiresesaned.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026508c3b0e---bijeditawinexukobanuwi.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/5107762246.pdfIn PDF document text
    • https://irantruck.ir/data/file/fijuwibufovarukedixozati.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d63313dc135---42880074345.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31842ce50e---sogogejawowapekugugepa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb3be2aedb---66275680115.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e8fae7982---32042182327.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c4ed8a570b53c397abe2b7751eeee5e7/wetukabiso.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/44cd3dfd2bcbd2354f0720a509ea769e/52313487250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ora%C3%A7%C3%B5es+subordinadas+adverbiais+conformativas+exemplosPDF 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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 20552 bytes
SHA-256: 65c3d8499ea9379942cc4dfd7ac63ea1ea7488db2ab6f48a37e9aa8016d56ca3
font_02_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 11636 bytes
SHA-256: be58cff6cb6936c13b8ddf6725a08703fc7acc9f6297abd3f409508706f4e05d

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