Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a74af7aa016684…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 02:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 543c26d8c91cdfb8e9bd2d181a599295 SHA-1: f2bbb9bb5f34912d2b36d0cb90177202c8d58fd9 SHA-256: 56a74af7aa016684e8189633c84d8b54f85751606009affe24d9fd4cfaf786de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

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=how+to+transfer+contacts+from+android+to+new+android PDF link annotation
    • http://iccarrentals.com/files/file/zovafirobivuvubiziwutu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/xujosexekonojok.pdfIn PDF document text
    • https://thebottombillion.com/business_school/uploads/file/todudigis.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16133a59d0ac8a---rawibemakamaxulasuxasugi.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/8535262854.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/69289798597.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/12217762101.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/70539173560.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/58283405232.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/63576052283.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/borakuviwamomerexezib.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/21729627034.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109090658227837.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a007509f938f36a0b59caae905272e4a/7775256279.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/19980618906.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kolafukimibiwiwifavo.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/liweki.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16137f708ab35c---36006017635.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/53181348846.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/4551789920.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/dajejubokuxifaluf.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908010203.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/cqb056d2935o2dbkkql6r13ft3/simorujomilebomif.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/70553320827.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 17220 bytes
SHA-256: 102a2e2db4a3bee1322eb17fcd46f1e5fd348f7cff59216413a7bf390aa59908
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 10668 bytes
SHA-256: 890c3eafc981a426cb21f45ff5b95625ea0d03da8240c632ecff9a67626ab931
font_02_sfnt_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1