Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aba10634cca70ad…

MALICIOUS

PDF

81.4 KB Created: 2021-06-17 21:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8aa35ef40c54f159b172f877b90635a6 SHA-1: 9e05937820549284e2f178191fd14b6a97fffe63 SHA-256: 3aba10634cca70ada9ef196775571b587f2ba300558b1853df7b313e1e6b0213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0847a75683---28344104807.pdf In PDF document text
    • http://duszek-lasu.pl/userfiles/file/ladimelevenimat.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/luvabulok.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/dezotavokazotobixugubal.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/zijem.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zunofesavetikobizepap.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c662a3dfa72---60562126072.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/51a5b563c9d779bf09ecb7fb5886f087/rufusababivetifabum.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/220a296aa39e0b91112b91462c66d1b5/32227304783.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509404b659---betazapi.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f06fe8728---33014053808.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849cd4c656b---fotusaretobidifemibar.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc40863d6---54502028577.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f696ecde2d---6682142243.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0148afdb---nobafiwilot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=extreme+hack+free+cs+goPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 5352 bytes
SHA-256: 12032a8ab645a8c683aaf20e9babfd618f196c1422746a085ea5897d16ceedab
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 11528 bytes
SHA-256: 833de6fe093521cddc57ba7c4f29a01080fb52ccfbaf9c67500207ef0a4e3826