Malicious PDF — malware analysis report

Static analysis result for SHA-256 add5f6fd8998c08e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e4cf147536a2a0518eef51a66c451e4c SHA-1: 46f471544d5c83a876c39c41372068df816669db SHA-256: add5f6fd8998c08eec3ae3d9a11a0a335826ce62847f5eefb155ca43ae510c9e
176 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7dfa13f0---2191050824.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p25t7cjvo0kmi8dek7kllnchfa/61305175278.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c336438d---fediduwadovuvotunit.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834e72445b---zigozejufodewuwerif.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a439df0d2ab---62462778847.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c467a43cc64---63546822437.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6092e3aee---piwinosatefino.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/lexole.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nomugetamefuru.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ef2a40f0cb1552e86bca92c72d834fd3/veverirunapufebejowepiga.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2bac3a200b658e0abcd6e3d6c8cb13bb/navono.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/jetepirototifojob.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/61288298767.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/af8d0f8c445b1b43e1bd8852efa26c9f/nuvemi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8f9d64d4---94934800120.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073886e25ae3---lewusugubefefasen.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/56284790836.pdfIn PDF document text
    • http://htwy.com/upload/file/mesijegapubakorag.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/sapupetuvimoru.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/499fc65d219074b6322fbe907407b6df/ropiruvireviduzisoto.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/razakejexotux.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lchlekpfnjt7emdl242u47dmem/zulavulogizibumog.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/75283868461.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/77182988136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=oregon+department+of+motor+vehicles+formsPDF 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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 11160 bytes
SHA-256: 1d276a45ef23b62a8ed9a5211fe6875e7d41c283a738f4b0f308c241718fc3d6
font_02_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 17212 bytes
SHA-256: cd23c3275d1ae75b36bd7a24f38d8654690496e737e796409b191cdcf23375cb

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