Malicious PDF — malware analysis report

Static analysis result for SHA-256 e487fa483f48b148…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 09:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97c9770fb7e6cd4489463ee7c11368e7 SHA-1: d0563be00cbf4558fd9d5d1b7c2538b749f1d1f3 SHA-256: e487fa483f48b148d1d7054f7270bd79dc12687ff08c7f96aaaa1c8408b7adec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=my+hero+academia+season+4+episode+3+simon+heloise PDF link annotation
    • http://ekstelekom.com/userfiles/file/xapixidibu.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/gutinepelej.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631762499.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/ruxaxo.pdfIn PDF document text
    • http://azizolace.cz/images/file/mikulozotojosu.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/womovifisujugapu.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/dofer.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594cbf05bf---bexagubaxapulemixewem.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131389619bde---66306873593.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/15650988260.pdfIn PDF document text
    • http://meskerjager.nl/media/files/12547483563.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/mupum.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/25522299828.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/80969276136.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/64975225226.pdfIn PDF document text
    • http://congluc.com/upload/files/36226178051.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c58bd5af7bfd073ba2a35d8e575fe0b/sebibuputidazoranitoru.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/lepupaz.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/1881021025.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c64d11a9d3c729c6d2c14302e4a30129/mifakaxazurapu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161344f10eb965---69919942395.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/70546717812.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/050232351599.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/23981437916.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 18292 bytes
SHA-256: 35d096533af2c73e39907c5339008ce0f938fc14f06f0d7d27d6588663b882cb
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 11036 bytes
SHA-256: 8682ac0f89ffb6a7d89c554b0e86406948200a799e793590b7a4809da0f49654