Malicious PDF — malware analysis report

Static analysis result for SHA-256 3390aac4945ffb5f…

MALICIOUS

PDF

87.7 KB Created: 2021-08-25 21:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 15acb70bc52433c0099637ba4caa64cc SHA-1: 2cd423a5e6e96ccae2eafdda5b778bc641522f89 SHA-256: 3390aac4945ffb5fcb765e8119988b230494d410938bc0fd8895e209e2266646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress uploads. This indicates a likely phishing or malware distribution attempt by redirecting users through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=the+totally+awesome+book+of+useless+information+pdf PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16117748e5d059---sizedonagiveguderil.pdfIn PDF document text
    • http://mebco.ru/images/file/jizimalomilebab.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/79872905523.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/wikusewo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c422e0f3835---luwarotojidisevasomo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tobijeluvepasetugakujukoj.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xakivowipuzub.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/luzoza.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/dajuxexavedapatizepute.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/f44f4de770bc82dcd755588b5d90f2c2/98816512469.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/81988350033.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1kmf4h8smov1b7ieduqb4d2hjq/90551377843.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f308a9ac000---83913530304.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/89734217896.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0cb0ee8f22970b540c4fe2c179823365/30707986636.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/2379010570.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8821747a6---78385684991.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32d1680f307d5b0d52862b9940d3a64a/96657981439.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e27db189ab---94127325202.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/22073764581.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d2daae9a2e47137f6cb01abbccf26e6a/tolepivesele.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4727f9728621095ae2d319cd680d5a37/pekoxuresirosuju.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/84d9a44f97dd6f3fd5af01e64e20b489/50235563049.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/mf2bhhp8mflklqnkbii45vqqb0/murivu.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/95095102372.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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 17056 bytes
SHA-256: decc2057abb7a47bad67c62e954847d9ef1c1165198d41fd64589e78ce19a881
font_01_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 11260 bytes
SHA-256: ff0bb6938d7c176ce0042d7f90358fbceb2b3e9c3615f2137199001543a67194

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