Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d3757b5131ead…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 10:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e5a2c9950feb17dd78a2cffcf2c55a86 SHA-1: 138eca871c7d0bdbeec79f2a83ce666d92d40d98 SHA-256: f40d3757b5131ead8ea65fe9f8b01e9e05ff50305d63c5875e5d508a4dba35b3
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, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts social engineering to prompt the user to install a browser extension or update, a common tactic for credential theft or malware delivery. Embedded JavaScript streams and numerous external links, many pointing to compromised WordPress sites or disposable hosting, further support this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://empezo.xyz/js/ckfinder/userfiles/files/pivagevaze.pdf In PDF document text
    • http://seyrimerdin.com/userfiles/file/tekojadarobujiposa.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e20f8a117e22774f306bbf7ef0bf3898/wulifutalitexusixijoxezut.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/61058771109.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/73359849488.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/bigoxumovofezamesixe.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6661902a6abacd9935ab8cfd55b43e24/purowokixa.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/38295476631.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l08r2qk379jhkvh0v03qrdlgli/37037387086.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607fab48a0185---xexuvuno.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/d71331e4e72ebd8f91fad3e98e027e91/powigojag.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/donasoduk.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210616115905.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5dfe1f2135784bd88c7c2106daf7ee69/47783305235.pdfIn PDF document text
    • http://www.emailposte.com/pictures/68979642989.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c0777051---36952850453.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/88547640076.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6905cc036---nusobubazobinalubama.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5ecf8e63d394d539f53cde47ade2b200/rigowenas.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5fc4f5d1c4ae3bb69cadf0aba6bc0583/12409548448.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a825ed2bdbc6952a3f4fc0f8052ecc56/99223209965.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/gojenewolexelif.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kesivosonosujowititasos.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/zolotunolosajikirepuk.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/mufuzexeroti.pdfIn PDF document text
    • http://allasclub.com/campannas/file/posujinodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+disable+search+suggestions+on+chromePDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 16680 bytes
SHA-256: e27442514909a575ebbb000718155efd68207abf2f26723fc84e5a9975ce4b3b
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 11136 bytes
SHA-256: c43b84684b239035be62b18583e2af35e365af1b81036e2f693a55feeec655f4

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