Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eee109295424ad8…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 07:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bcf35dce0780d384edaee2b98ce0b70e SHA-1: 73098f0648456aff89d41a01bb03f3b2f6efc731 SHA-256: 9eee109295424ad8a278690898b75af975ff9e7bc18fbd31fcdffa8ca386d698
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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://matfplayer.com/calisma2/files/uploads/69238609218.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/mejaralufejif.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/lovetiwugagalerodugesepu.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc0d2e803---zanadakefe.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9ff289c9e9dd631cda0c3ef455877943/5782493885.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/99580356964.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160721a366bc57---fipakanegosovesodul.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jenojuwopes.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/31510476757.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0d982eecd3e555db1f40a02ed7e0f19e/nelow.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/pagetakefamutatojode.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a8faf1ca8---75070643912.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/tixekodaparap.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/11273359256.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a2d3cd5e2cb24f96890e65ca558794b1/pevifewareti.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55eee2300e---71131998998.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/boliragabofu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/44540088230.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/74552738584.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d184271d7---23800623881.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/83f42979280b779b03a32b4b0b4f604f/difozevenalulozobubifewag.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23911893905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+can+i+download+whatsapp+gb+new+2021PDF 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_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 16836 bytes
SHA-256: c908e53d79f000f382007ac8032b71675c53d0067496009a1e7430e48782d96f
font_01_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 11204 bytes
SHA-256: 52bf0a999083ad143374154c19b62f2c30738aa18f63c15c5091abf9f11779fd
font_02_sfnt_off00013b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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