Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd670c0c1cfca16…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 21:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eb426917cda0487ad7bd163a412684b SHA-1: fb0b446d2e66a7f162d0d4e898776f50ca01239f SHA-256: 1dd670c0c1cfca16d5935835797576ad6327a0b9523a4e8d7bf1e899e027d274
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload directories and disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://uro-medical.pl/zdjecia/fotki/file/99319500752.pdf In PDF document text
    • http://agroanaliz.by/upload/editor/files/pekogofileva.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/6217208952.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/95506894815.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/67975041546.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03ae10bb3a---begonowilez.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c978b529faa---77147724085.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b301240912c---zenitamurigalikexenawufag.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1eqjve3l73rml8c74bjc4is1o6/rofuxisinukogetowo.pdfIn PDF document text
    • https://renetravel.ro/images/files/47956722714.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/xiturenixedabagutejulite.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784353f84c---84986998458.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/66346992854.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/92118312878.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/699f3adccee47ca5e633e0f28cdcaf12/12247152857.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9f95fac6afdc4d6d6362a9a83e2cfb9d/29336134358.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/kusebogozulosujefebikivak.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/mikaxotanagukilik.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/lenox.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/144051281.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621315875.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd70a12c4b---xivowu.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/neduzepafarogovelaki.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac408e42e18---tifikagupirefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rangkuman+materi+biologi+sma+lengkap+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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 15000 bytes
SHA-256: f1a5168058e2acd3e8162d85229ee31c8ecda19b1082ae11f5fb93bbd69b8cf4
font_02_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 11220 bytes
SHA-256: e22357328450156c3ad29db33090ed4bb0d7ada047bd214a77414e40b2cec2e3