Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef88e0c11c3c9e0…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 09:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c27f6ea1f6f337627b02d78d854a3fc6 SHA-1: 919a430e9d613717b6a9465f6d2f611b7aaab609 SHA-256: 7ef88e0c11c3c9e030d373c070f7f8684363f89760010c80450a524264fbf7cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including those pointing to compromised CMS uploads and disposable hosting, suggests it functions as a link farm. This pattern is often used to redirect users to phishing sites or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=why+are+my+text+messages+deleting+themselves+on+my+android PDF link annotation
    • https://agrimal.pl/userfiles/file/5742493288.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/82e4ea22eeae3957bb393a4318675f60/tozurovitekesusoxagitupad.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/45128546765.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/58331487566.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/mukupofogomixaxasagejuz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411a0307c12---83297991972.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631532121.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/xidobasemegedoj.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/veruvupibiradiratufonex.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/54527997926.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911152320.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/65718604092.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/vukotinagegogexuvuzotodo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ea0e39f96bdc027e3b9ef4a9d402281/zevopem.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bef95d5024---ponudu.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///14485926688.pdfIn PDF document text
    • http://aurora-c.jp/files/files/41118818604.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/xasakufabegitemenobiduve.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/44078558701.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/gogagibulavoraguwut.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/97535967807.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/79504158802.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zonokozofesoxilidimo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/13868068804.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff12a96f9b---mivozawuxewet.pdfIn PDF document text
    • 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_off0000c554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 17400 bytes
SHA-256: a7c31314ab0151bb06ffc0203bbdffd89db7b5661ad473317870c61119358613
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10968 bytes
SHA-256: ac67892585c92cb7867346c00a8070195af0936c872a7f61266015f1323b316a
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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