Malicious PDF — malware analysis report

Static analysis result for SHA-256 16efd8d251c4c213…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 06:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 566f32fa132605266f39389d8e0a17ef SHA-1: bbeb58660c97a6ec09c54a45031a130ef8f1d2ae SHA-256: 16efd8d251c4c2138a371c7decb84a295cd67330ce9af125d798e2fc6d47a948
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites hosting further malicious content. The presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' firing suggest the PDF is designed to exploit users, likely through a phishing or social engineering tactic, leading them to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11d6b8367b---15551152125.pdf In PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v2d4m2qbqeouc4v2241cq4voph/petunesigalenelaboder.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bujunukazedatewobegu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d75b9e74---nezajifazudaxojasidufo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/68a460aa52d870d95ca5df082edcf33a/59699960258.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9a862db8---73105650477.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/lelafufebewivolivupifo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc14ac6e8---dagazokeluxupu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085f95243d6b---mubawasopegofugur.pdfIn PDF document text
    • http://regcureguide.com/files/files/sojavanali.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/18308b0bd490efd3c36890e6dfa09afc/juvelemolijuruvux.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d2c39373---tejusukuziluvomezo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807363db61f---70621724808.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/35782069095.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b183b4153---32860552991.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2443307d26cf55c4577aaa1a265b4a24/puwudisugowozafosusesozod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425831ed39---xixoluzerewipixexopifap.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/42442359279.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/gedaverak.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bbcngb9cl3klultrmanlgs2ea4/50486933562.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f823e3d9ca7cba6bae557525b271324b/tewijibonopozij.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/devunowexafesevam.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gajodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=think+without+ink+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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10228 bytes
SHA-256: 9e1a6c7d92b1ad3cde5fca82026f2c334643cd6bc8f18727cf932b493366970a
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 17180 bytes
SHA-256: 194b42efe8a41c652bc2b6845ed4adb67e8eeaa626dc52582065b6eab0350f9b
font_02_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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