Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3e146f049819a3…

MALICIOUS

PDF

81.8 KB Created: 2021-07-13 23:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fb846d5788229eb1e677a9e3794fff3 SHA-1: cbba00328ea4910ff5aa352d1b968c1130c72223 SHA-256: 0e3e146f049819a3ea1b2825602fe18e0d7774ddce366453393ad9b726ebaa80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cd9b915c---49703396618.pdf
    • http://www.awakohchang.com/image/upload/File/oriluduz.pdf
    • http://instant-image.net/UserFiles/Site/File/gotafupanijuvamaza.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/au7romfc5qr8f1bkglpd6iqq8h/kadajije.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/92576624154.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5abe738db53192f8b9ed336c8fd59455/461552177.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/niamue4p7sk5ijehg7ufo9ug64/74991351330.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d21bef625e2fbdba84423d6c4e40d322/fazugixiga.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43e3b7c18---88616869141.pdf
    • http://whatdwellswithin.com/file/68274807496.pdf
    • http://harmonie-avion.fr/actualite/files/poliwipef.pdf
    • https://areicon.com/images/file/19934245737.pdf
    • http://allmedicus.com/userfiles/file/36374731508.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6303ead082532cf0ca4896a1881eaf0b/tufadukidiwibize.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/sivazotinoganawi.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0184edfe7a---76852658680.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/jozuwevatuwugadononibum.pdf
    • http://peaceinsrilanka.lk/userfiles/file/48669632617.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16f111488---vepuwudikomiponegemef.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67b6bc7c51---10764136360.pdf
    • http://dlmberatung.ch/userfiles/files/fatixibodowotetovox.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf8d0a455---10472524769.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2798911ca6bac5e15c4d9065fef9041e/44801184091.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ind+to+cdg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd70.bin
77a2eee05c9ad5876c32be8d07055c739ebf305ce0d23bd37eea30d806adc123
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 17420 bytes
font_01_sfnt_off00010b6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
font_02_sfnt_off00012382.bin
83081f22d268068749c88bbc0a48585d517ffa23b5394701ef414c7411b257e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 9796 bytes