Malicious PDF — malware analysis report

Static analysis result for SHA-256 3021439dbb22bc93…

MALICIOUS

PDF

85.3 KB Created: 2021-09-04 20:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13352174ad37b2b495584b1928ba927f SHA-1: 81a97252fcb5a84005b6c4c0b51e9a4444783436 SHA-256: 3021439dbb22bc93c442a988a17e702ae2c1dff61d611c5fdf460eb08bc69c4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of a link farm is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mf9sjqi4jjs49dmbpvrn4dp53o/suxafepemog.pdf In PDF document text
    • http://tindangnhadat.vn/upload/files/28556280955.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723a8c90720---nuxukiganolevuwukesadul.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/38140340371.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725de0e62f9---tetawekimugolalisavit.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cbbu80350iv0rhmea9lq21stt5/71965886106.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wivox.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/276586362610f783003be4.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/88551456943.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/1s7kkcj4dgv9e4notq98l26401/44341768249.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/98358020378.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d11a25939bd8d9114525bb6671a0acb0/8686766694.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6eea8f9c---96202483552.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935ab3f141d---56557607145.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/kemowaja.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/6195636267.pdfIn PDF document text
    • http://honda-vo.com/upload/file/17293157842.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/93028739201.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/vesobezuripaduwemotujaf.pdfIn PDF document text
    • http://e-sheremet.com/img/giboderilopumeka.pdfIn PDF document text
    • http://zerosquareonline.com/file/54755656607.pdfIn PDF document text
    • https://strechybenesov.cz/content/68290346805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=analysis+and+design+of+parallel+algorithms+lakshmivarahan+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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 11196 bytes
SHA-256: b68af66f210b4467c526d23ba61a059d84b60941de8cbbf889c6324bdea6ad21
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 19104 bytes
SHA-256: 9b63b91cd009ae0711cd86b441343e4c1c92ec78376235493379682981bf7613

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