Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae72af63faddd798…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 01:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0129bcba562d0336f37237a4cc469118 SHA-1: d4c97bd71a16bdc160bd4c8602e697f0516f9bd9 SHA-256: ae72af63faddd798a98f1c791cd0c20ea1601748c31e2bad1b27224386e78aba
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of embedded JavaScript, although not directly executable in this context, suggests an intent to perform actions beyond simple document display. The ML classifier strongly indicates maliciousness, likely due to the suspicious URL patterns and potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 https://pima-alarms.rs/slicice/file/zekotuba.pdf In PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4jmiqmbi2emcb0dsnetqe8g411/balidemajujijoje.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/mawuzulenij.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfd9bae2ce---35840040232.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/72710929763.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bddfb3f01e---80969031887.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210830_211558.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pafijikukidulaxowas.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/50c5acd75dd65481b1790e3e1e77a1ca/74540120878.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/sitaguxosegojularo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3640b8eff---nizedenafakibojesesik.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b09006589919e13ab2670660bc1f782e/1307458805.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c729802a8b4---rivipalidubopelerilolage.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e58hjf9mqdemacaoav2fogl225/73840167158.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/vufefumebe.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/tiperij.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-19-13-51-37-jqXDIKSk.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/52789995521.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ghpq0cc676ilrdk198ogm2o7du/21967521147.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eb5e153b34854f904f44cf8b52de936a/wobepetonataf.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/72423799539.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/713224159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=circle+area+lawPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/ginukevitatibagizovaberow.pdfIn PDF document text
    • 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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 18972 bytes
SHA-256: b84c4700a8563ea2486df74c4394fc2127d0981ed06dfadbb6b01e663bd2c8dd
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 9852 bytes
SHA-256: 790c564492526a2b6890c4d4cb01347fc95314f2df6efd4e1cc009f5a4c29e8c

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