Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4072291dc1e05…

MALICIOUS

PDF

95.9 KB Created: 2021-07-03 09:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 432db07fa78f17d1347ab18e47f8051b SHA-1: b87fddc492f297b6b7f8489dfc5ce1a16806aeab SHA-256: 8ff4072291dc1e05038e83bc0759f3e0020471beb1768014796dfe869ddbfe6d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites and exhibits characteristics of a link farm. Notably, the document includes an instruction to disable security software, which is a high-risk indicator. The presence of embedded URLs and the overall structure suggest it is designed to lead the user to malicious content or facilitate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2eac57f6---bexatutotexukekenagakagij.pdf In PDF document text
    • http://portalpr-b2b.es/img/user///file/_0015634001624246353.pdfIn PDF document text
    • http://azizolace.cz/images/file/91129688735.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/pijazidaxuni.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/25798958711.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b5561e64---30019989193.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/numemakizol.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/18844451033.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819e1e1225---87788170907.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5206ed8d---57388652101.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c485a8d990---77507569239.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/04bc93f4460f537fe47f21a221757657/bikojebukevov.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e25497ee36bdf0859fb9f98be5ef11d5/jamugedov.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/defbbf7d818cafc75c15e1fa46012eae/71087981631.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8a07bb8f---mutegosowi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092528ab7f8c---kuwipaximexagabu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/64k5d89akmkju29u17iogob2e3/muresitivobaviw.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73b41ff3b---44677088122.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/mawazokuziluradudo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e300d63---segijalugukofajajejan.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c52ece8ee---womuladodujefinujasubusol.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/34221496390.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/dajuxazivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=forager+on+steamPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 1936 bytes
SHA-256: 7be29d029cc9edd1ca65214835b7df57e29855e267137a0e9c654e8bd32ff9f8
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 16120 bytes
SHA-256: 5cfa37fce0989fcd98349beccf9a63719aff29e66b00f3ba655f54b68a91f5d5
font_02_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 17888 bytes
SHA-256: 0d5aca713e6cc5fc442286a1f1ffe0fa3e944b305ce8499344a5ca343e2bdb27
font_03_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001592a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592A 10292 bytes
SHA-256: 35206a80cba90b7dba457c6539460c9c0a618065361fee02c99ee7b3cd84ab1c

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