Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3eed9afc6d9af3…

MALICIOUS

PDF

78.1 KB Created: 2021-06-27 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1b213b9f1ea659693921777dd8fc765 SHA-1: 0c6dae9d7cc130160f2b2bd5348a9461c961f661 SHA-256: df3eed9afc6d9af343697d63817a6d3718a8348d71e9f171422d419d29cf27f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/09ea16539c4b31e83abf7c1fd5325364/dixajat.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/645cc329ca8fcecaa81cdd6863361b2d/36614767120.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda5fc1824---45628921056.pdf
    • http://alhouti.com/userfiles/file/5167905699.pdf
    • https://avonsteel.com/UserFiles/file/50936443050.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7dd8d10d99cca709e89fe7aae2c8e67a/kelazemuxezupa.pdf
    • https://samarpanbharat.org/trila/userfiles/file/50066155980.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/18099508ea530462bc873093ff371891/92895739205.pdf
    • http://alituncer.com/userfiles/file/53964828611.pdf
    • https://cuacuonbentre.com/upload/files/binekijowotutafumofiwukas.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c633bb3c97---pimagitepe.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ec4uig11dp2mo76ro01rajd1r2/31372027475.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/q78ap9no60js30d3p7sohf4oqf/49004868497.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t39g87ap1i7qpeusb01osa2l77/92454698505.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4d211da3bba5fcab04c5d5a1a502795e/rexugugop.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd448dca58---97040260871.pdf
    • https://geniodelweb.com/file/67819546655.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56eb09a0e---1329940764.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f8890c85f403af1970e3b89ab3ffb20d/43002352060.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=find+the+lcm+of+3
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd70.bin
eca703af9ffa67ee09b829b9209233c324a2865ea187857d228f6c750474e575
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD70 10460 bytes
font_01_sfnt_off0000e4e4.bin
419c462bd09e3af5d55cadedc3f886315390b58742ae466c216ab7330b7a3931
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 17176 bytes
font_02_sfnt_off00011229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16792 bytes