Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e2b1570b0164b3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-10 05:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ef8a4cb626d22049d8ff5b630916d9a SHA-1: b2b916a2c4ba4e92c81eb2dfb7214914d21d1e08 SHA-256: f7e2b1570b0164b3c9172e89c5be9be8de8399bdc1a7f53dc5171738103e5edd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138351509a9e---42086629167.pdf In PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/27788696301.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/69948031051.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/82326913439.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d22079e1a---febavofik.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nozevuketurukibeva.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/40173339020.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/85668704913.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95846825217.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139969f03b51---sifojoniretuf.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/winetoripan.pdfIn PDF document text
    • https://airxps.com/userfiles/files/35131398097.pdfIn PDF document text
    • https://clubon.top/uploads/files/perosifuse.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-01-44-18-97.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/27313356220.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/nelazega.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd804bdfa---57908629412.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910005542.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/38463889474.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/sorebo.pdfIn PDF document text
    • http://saaretravel.ee/images/file/vipiti.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/96776480534.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zazemujobiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=blue+wavelength+rangePDF 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_off0000b493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 15492 bytes
SHA-256: 696e46fc995d5fe1956a672cf132f852cc0c0fc2d7c2bcdca1081271cf9aedd5
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10312 bytes
SHA-256: 226cecae85608bfeec872f810cabd810b4ce2ff45cfc0cbed40d0d34f7a7ba8e
font_02_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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