Malicious PDF — malware analysis report

Static analysis result for SHA-256 9625835dc08a7b28…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 04:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3b79fb23317f991bf3172c44e346220 SHA-1: 009c225e5bf4748cbf239c75cfc6667fcf125c6f SHA-256: 9625835dc08a7b28dcb83df3e76bfbc359068b94559737c4255cd3b7c69134cb
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggest an attempt to redirect the user to malicious content or download further stages. The 'SE_CLICKFIX' heuristic confirms a social engineering tactic instructing the user to execute commands, likely to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepoxizam.pdf In PDF document text
    • http://euro-ex.com/images/blog/file/foperig.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/521e2f3d2ef114583200430be0f578f1/zebafakawixarixorib.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67099835869.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/91190299403.pdfIn PDF document text
    • https://dafelia.com/files/79156642778.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/gexatitiziral.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/98162605278.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/wuwererajodeturozuv.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/36870875130.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/65279807039.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/82311416856.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144b313e1398---69455288294.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061216524063.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/femelafexakelus.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/93556414678.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/bamamobamoz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd0acabb9---83652645405.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e22d7229---pogod.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dotewalekalusaxafe.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/pizasubudofozagu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614670e053454---januxax.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/vizarulilegigo.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/74766398774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+take+my+phone+out+of+safe+modePDF 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_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 17556 bytes
SHA-256: 0bc47b118889af21f632cc812f9700593326d76b277a170400f1994cccc95f19
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 10908 bytes
SHA-256: e15295ba9c51c72cb3e783f239588d0cc6e3614d794e2315bd91aa34b2195433
font_02_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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