Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f679c0e75773c9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 21:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35438265d3683b5d2b10b1a10fc1b5db SHA-1: 9d9f3eb9f0557b704a44d3a4ec846d810b1c8174 SHA-256: e5f679c0e75773c94ec63393cccc3b6d7d12a36d3f9b66c43e1c892239a1287d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://lumieye.com/userData/ebizro_board/file/4325732815.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6cda2718---32787013889.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4dce68c39b7cf77494a57c1e38085e2c/13187914718.pdfIn PDF document text
    • http://partnercable.com/files/gamuje.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/xobip.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/66738757251.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/kizebulotipesutijigugu.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/44287094453.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/tugetigojikutumebokesife.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109021806348082.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/10801928285.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/66676144406.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8489362b0a5971220e513944470d35e9/45308144161.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/43141040351.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/gedarosojinez.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/113aa488939281350d0fa0ef20c3031a/wibareg.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/vutax.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fidujemovaripobuximis.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/25215e03fbb0adbf061efd5734b19f07/93682251872.pdfIn PDF document text
    • https://greenways.at/userfiles/file/16917041449.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a406de696eac549deb5958d86d216a7c/60875729042.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27428968528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=killing+floor+calamity+apkPDF 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_off0000b48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 20160 bytes
SHA-256: 6ac163409a1734247e274dab3510784dc581a6c2adf9090b4ca24f8c77f0dbd3
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10720 bytes
SHA-256: 4f817991478cf7429156e57417a1db15361e3841bfbe06f9ad83ea42a7bea6d9

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