Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd227104d0a11e20…

MALICIOUS

PDF

113.0 KB Created: 2021-09-02 08:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 348c33f10e2bb33393aed398dcaebc94 SHA-1: 7592b87b6d2b3dd808a8490d0126762d537e11d8 SHA-256: dd227104d0a11e20358d45094b8f8fa94fc2223aa37fe5d47f884122355034c7
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://polipadel.com/userfiles/file/3076456716.pdf In PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kofigididisewe.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607719a4077a3---89177165890.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/640883afc9e475cf9bad0c63dd527e5a/98912235572.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/dunor.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e77737151da---diwotugenufuxosapovuvib.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/01f9b181db0f7a9e3b7366b2533c3432/pajitazugata.pdfIn PDF document text
    • https://fond.ru/userfiles/file/92410791934.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tegenozonitotoxubob.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/gumulowinopid.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/73777685301.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/demoluwuvu.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/4923890498.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ik2u27miamevk37u0a709ckkdh/jopewitadenag.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/61igkh9urih89brdq9nl3eppt1/52090510971.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/dipewaralonekurisuxureseb.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/88659391739.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/puvufesibusoxilo.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/bawukimixuwejikokajorudu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e899dd57---denolerukoxibenumaseled.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lebewifuvegej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=home+remedies+for+leg+pain+during+periodsPDF 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_off0001567e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567E 10832 bytes
SHA-256: c1e7cdeebbd300bba081f3453e0804c5b3769d5020f2113f0a2f54600771786c
font_01_sfnt_off00016f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2B 17696 bytes
SHA-256: 692a59b30bb078449bbe5447e5e70523bd98e959502ce4b110438a24f16bacd2
font_02_sfnt_off00019cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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