Malicious PDF — malware analysis report

Static analysis result for SHA-256 2909a6cb93578233…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 09ae3677ff9eec9ee978e0d71a17abef SHA-1: 54cbf4dfe5fc6d6a3cf9a5b02a8771981a8ee218 SHA-256: 2909a6cb93578233f2e9c51ec32123301ad0d025cf51daac7d023d487689a47e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, including those pointing to compromised CMS uploads and link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=forex+trading+corporation PDF link annotation
    • http://w3-japan.com/js/upload/files/zezutexeju.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/80795119052.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/44842813717.pdfIn PDF document text
    • http://acril.ru/ufiles/files/35937319230.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/pobuwedusivubopiwazubok.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/pewavimesirulefozal.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/zijosodol.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/59525442667.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/65901421360.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/3710227170.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/tegoger.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/59969648041.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/tipasevililujevid.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/penoxexigetuzotigugulisa.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/wiranipanapazanolonadaf.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/31789017294.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/muxufadoxafako.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/zubetudiseguzi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16158aab786d2e---65814761964.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe01db264a---vonagepuzupegamisiw.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161521322d17d4---goluduvogewifixufedukob.pdfIn PDF document text
    • http://elskenecologie.nl/files/bufem.pdfIn PDF document text
    • http://epmachine.ru/d/files/16733043624.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614351b3835de---32089127345.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_off0000af98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF98 10552 bytes
SHA-256: c8da3c206f000cc2e0a5560772a1f6f98f25e54783fadd73e5a20a1f9dffdd41
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 14780 bytes
SHA-256: b76349e362843a68ecc9cf3ae4fb1b972d1c29984989169dda699613bf48fa1a
font_02_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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