Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c36efc829b120…

MALICIOUS

PDF

72.3 KB Created: 2021-05-31 04:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61a1b532c695be2e9515623b68720900 SHA-1: 112bdb5b716273866bb98fc2989228d466052abf SHA-256: 9f4c36efc829b120683cf406d32f6571d5456f5bfc8e270ce98bd44594cd1d7d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites, likely to host further malicious content or phishing pages. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the true destination and distribute malicious links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e5956455a08a584d61fd1a42d3e8679d/26832976337.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7696722928---19464765288.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c5fd9484---11816804314.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9m5t00pbj14edn6tja72jagfv3/53225356345.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/35884205551.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/272e8fb611b8b52ab7f7b957aefac390/56931373706.pdf
    • http://akkoryazilim.com/userfiles/file/66608641977.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959ddec14c3---xerutugukumopasujup.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4a06ls4f255d24h7t3va8t85n1/soxenowoju.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160758a20c1000---14373601206.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/olkn7m6j08qdpcmhbgsgssl6mm/dogifavonopozuxibagunu.pdf
    • http://planetamama.ru/files/file/gebenitunefowifojib.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/sicuvk4guvfibm1toitks8deld/20621457488.pdf
    • http://nicolalazzarotto.com/userfiles/files/99543531759.pdf
    • http://dolphinkorea.com/files/files/netabapeviriniwovopefub.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ee53f62b---kelimuxigetuzola.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/fef21cb077119ade11f2eda4b740d37a/54354542476.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/022e1371860a59ddee966b4ce9ebf62e/dafut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2000+honda+accord+repair+manual+free+download
    • https://mediaget.com/userfiles/files/rulagovoki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de74.bin
7afee6ce70550a98ee69a314b7ce9762ca1737537f9fbed6a13d32727fac1c52
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 5488 bytes
font_01_sfnt_off0000f106.bin
dacbd2bd25575b73647b6a4d77df6f89833d905a883e6e1d075507b58c7eed8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10228 bytes