Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83d7e91dabd698f…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 13:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4356a31251b081197babe2c65446568d SHA-1: 37546280d9f22c3480d1935276a1473a0bded821 SHA-256: a83d7e91dabd698f405501573aa01213d0a3d58be0076952e4e98ec7e96ae816
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://crysiq.ru/uplcv?utm_term=how+to+unroot+the+device PDF link annotation
    • http://musicandyouapp.com/webupload/editorimg/files/41265640191.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/09102110820.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/28701573512.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f4ddbfbf---39921118738.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/65697090611.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/pejigewobogipaxawerawite.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tlr5h2l4hi5mt8piasi8gmbm5l/92636888252.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nidobugegebaxikuno.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/46910596342.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/2125354654.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/40345566435.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/nakamuzisukitana.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuwitowofupexepijifage.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8c260d6d8c2d7f572f68e470e77b991e/rutupimesenuladowanami.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342a238ffd---guwufajajif.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/67338911885.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/7727208195.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/73850365950.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/raxawanagopokixu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/45946539588.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/litavotegatu.pdfIn PDF document text
    • https://preciseenergygroup.com/media/setadomameleraxuj.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/kagubarezexekoni.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a25972b80f87b71dd2cd3c14f9ab39b2/27133729300.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea6e9be1f---kegogunotabatajexu.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210909011155.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_off0000c9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 10332 bytes
SHA-256: bf8f9ab506ba2596f18c55215c6488bbbf1efddfcca09570537a882b7eadc4da
font_02_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 17504 bytes
SHA-256: 315957bb7f785e85f4089007f51ef8f134ee5ea9ae27eddb01abf1382a99f1c2

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