Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1556022ff591a33…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 07:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 262e5561c188b8305c1359fa2ae62391 SHA-1: 89229e0594aa1a9e9feffd97e7498fdf04afcf93 SHA-256: c1556022ff591a337f9f358eb97446dbcfaf629487e8e0490eec8a86791947a0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/200dea6742105ec5fc1d1f4aee6af160/19390299447.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/417ad908913497f5d11d4a93680815bc/2688921622.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/7qa05bts1fmah02lmibksiv4r2/zoguviluziz.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/65071061015.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/11199824275.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/vaxubexanukov.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/j3bn0omg71mvoc2t0157doeukq/86158899016.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2c56bbbff---pujopuwigugere.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/novawogowofawa.pdfIn PDF document text
    • https://aksusu.com/upload/files/78020159576.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/gagujobivaletipeduzawu.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/64840347082.pdfIn PDF document text
    • http://davcpundri.com/css/file/pazufimevo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/18bddc3cfa039d07cae84c707addfd6d/16329521752.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/19124669516.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611873eada7dc---52460263164.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ah1de59nkgrpnke9cjucji10dk/13836257916.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/tazowutapigodiwe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160badd7f9824e---91304748235.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34f38a4ea---xiguni.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/safuzasakev.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/25375823284.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/3nrrdos3i5edkihc6s78q5l7n4/zivimisanixepoxejolugofux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=manual+bookkeeping+journalsPDF 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_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 18780 bytes
SHA-256: 22dfb7be921e316d76d410718cc486181c8bf9125ccd2abc0c4527ea5bcb82b2
font_01_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 10784 bytes
SHA-256: ebbf494e6acb288da2b0b4f98fa1eb22ecf7f8c967183b8a3a00e396ef5b6960
font_02_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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