Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f68c92e1df4b39…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 09:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e2f72801c04c6ca30f23c9ccb0574a2 SHA-1: 3b2cf12a91b9d97e94d89c1985cb6272375650ce SHA-256: e2f68c92e1df4b397ae7bdc8e86fdb694a542522368a697702aef40c381cd729
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign or serving a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://landtop.com/filespath/files/20210910234444.pdf In PDF document text
    • https://stonebuild.bg/f/uploads/files/sinukusugiwinudim.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/xorina.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/014322707f8393a06463e3e4bf3cbb1b/85551085109.pdfIn PDF document text
    • https://sinarwaja.com/account/files/kekik.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/17536604883.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a9fd4c401a7e6d7cfdf420a9c9403a34/vamitug.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210903_011118.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/lukafixor.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfcb58b7f---larerodutesezefefenutixaj.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wozewipomive.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/46328138215.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/63150987090.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/dunomejirewu.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630879769.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/pizanetupakak.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d3907232---bigojuxugigikiveni.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/76659527182.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/60981639963.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/benuxanapajenapemaso.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zokex.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/61987132755.pdfIn PDF document text
    • http://ccsl.asia/files/16310790041.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/7290937385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+emerald+where+to+get+cutPDF 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_off0000b564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB564 17108 bytes
SHA-256: b29ae2372f0aa3ea4f1d6ce39d486208445ddfcfd4034ece055caa3136d30487
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10836 bytes
SHA-256: b8aa02e9cb536dbc94eedb2d9cfec5070f0f01df4506b38d4b9adbf7484010c9

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