Malicious PDF — malware analysis report

Static analysis result for SHA-256 8827fae57749e827…

MALICIOUS

PDF

87.3 KB Created: 2021-09-15 12:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5419a6af55eaaf07c91dad5e1f65c7eb SHA-1: 4a7ae31751537077ba8917ca8fa5bd5cfc0ef2a6 SHA-256: 8827fae57749e8276577ef7439fe6aceaf405d985c736d59d6ef23e630f0b794
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malicious payloads or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mrybalko.ru/files/rifizigibigavijoge.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dac3a3ea11---zixokug.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/4338085427.pdfIn PDF document text
    • http://msiutilities.biz/documents/pufefijison.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355fb510ab6---52126760139.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/xizojusoretagi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e93b0234abddc610fbfeafe6bb15edb6/zufodozesu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1c02cb8dbb9aa26519e9762646eb19e4/86013758393.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/66461068203.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/6205337370.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/mogumowipokimasubiluwop.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/69214740249.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/begesapoj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5611cc7b94d1a19c39b8f23cee3ca53e/narumodusiraxumesede.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/89980813497.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d177b27d1---pepupiwugonudotimodefo.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/266003357.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/68971776655.pdfIn PDF document text
    • http://halmar.info/userfiles/file/kerofoxarodovesatanitod.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/91450210313.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/57538121816.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913000116786599.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/37682889668.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/ridek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+get+free+gems+on+episodePDF 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_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10712 bytes
SHA-256: fc15297aa7a8632f214f9e12a2c6931b12028e9367b4f3b683c4469478c15f0c
font_02_sfnt_off00011e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E26 18732 bytes
SHA-256: 807f9c9ca6104afd0bcf436f799aaf733d62a1661d3a50d4544bd3729319568c

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