Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2a630fa04be949…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 18:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc27c456b649503d88e9409b2bdf3154 SHA-1: 0575e59b3ef7d5fd30da56bfed265f147db9d0be SHA-256: 2d2a630fa04be949d08871a449ea71cdc44fce67c04202a3d162a73cb25839e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://win-win-keiba.site/js/ckfinder/userfiles/files/luravunurisilaxatoxik.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-11/20210611124240783364.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • https://bem-sa.com/img/file/19673122438.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9chmai2o5klofd838ohd4nsp49/56322976705.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/nutamixibuzojabororos.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d76d6ec3a5a65b161cfe6e48bc469206/97183406089.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/dekutixekaf.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bccaf61a7f8f18b338c729d61653d1d0/10436571637.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ffe058e99bf8dd4e1ca342c7abdb1d39/kolavepijezijideb.pdfIn PDF document text
    • http://minipit.com/data/files/75045011920.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/16dadf0ba3377db05c659ac13a8f7cad/70486506974.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33309e8d1---xirefotad.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/21700356989.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/muxon.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/ronikufijaku.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e17c7f2b61---81631426677.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/33268405532.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2c19083c---52600976036.pdfIn PDF document text
    • http://ministerium.pt/files/rozeg.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/nibimoriribusewa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/788ba87764417a124c8932312de84b42/fafaxepaniduwubofakijinew.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b158c41ab---xujufirovusojogagufinuf.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/edae003c8781f81669934025e4262cf1/bewitogoradavazowemepurar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=examples+of+good+book+forewords+pdfPDF 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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 18844 bytes
SHA-256: bf81a61eca08608a844f770362941f132126f782bce0aea425f81420999d0815
font_01_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 10952 bytes
SHA-256: 73d1a316eb4380afd694aa723ecd218c81c1a919b3721ccb9588785c7c5ac5d6

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