Malicious PDF — malware analysis report

Static analysis result for SHA-256 d267a0725eedd5c4…

MALICIOUS

PDF

104.0 KB Created: 2021-08-10 06:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e2c4086e257a412baa7daa681b4cd2e SHA-1: 30a7bab13f61419dce8f867a4d9fe04de1466c6f SHA-256: d267a0725eedd5c4a3f217d1dfeb0b96275d209e6c0a0f29a72ee8ae59ef0685
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3945

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819d42d4764---54952297602.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4684aa2692---tewagejemifux.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/zevifogalegumadomoluk.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/45693676137.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/51966063228.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e175cb97---padepodemilivowogagimeg.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/27974119058.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87dbc30d5---lolijeveponedabugejolus.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/67520072467.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d3895d92---pipilod.pdfIn PDF document text
    • https://sanmall.ru/files/uploads/files/61385249331.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/46181908558.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80c1a3142---jafagopo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e41891d016d914cd3d04eda4b9ec9ac4/rinonagodatotagesene.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0e621ef93ac094eebf274fa82ef28533/31575796959.pdfIn PDF document text
    • http://abpaluso.com/upload/file/76181729157.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/tifilojavetodok.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zoxaxigulaberapupawevol.pdfIn PDF document text
    • https://siroyensao.com/upload/files/87828218143.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0df64829---nokiderozuzuraw.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/vujafotoragidabasuwet.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ch897b03vopng4s1pfptb3mmts/tafopazalagaxowojemiluf.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6cc92d5dc---vofeg.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ea2ef780d6720deb0be050d74350341e/29249126092.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/a685652950b077ce731ee60fe6cb35ae/20962240005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=human+molecular+genetics+strachan+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15027 11244 bytes
SHA-256: d16b7ac22b9f6f4f364240938b8113af15bfcd48ce8ee928f6762200dcb6b767
font_01_sfnt_off00016a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1B 18212 bytes
SHA-256: e43dc5a325cf31b6317805e9c5680dd11e0464ed8a610061ecfa35e69da00193

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