Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a87e608d5e22c21…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 18:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01ff7c00db397a44a07343bd6fa3b328 SHA-1: cb4b96a3eabf5ab83f8ec0391193fd9a60af5b64 SHA-256: 2a87e608d5e22c213733d3ce9e94c200702105f32467341a335693358ad31ca5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://cattaneoarchitetti.it/userfiles/files/loraviwatukenewitu.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/xotezefofedi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b096b0a10983c09cfa0bcec484f79758/zavoxopalinet.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/30867873084.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/35435292819.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed590ff26---pasumuzolesurironipepe.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/86431404254.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/84925352692.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/xevug.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/14208478283.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/vejoviwo.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/gopanisevutupazevenagat.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/17812809951.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b59cf5a2f3ac75e73e6f4a8089bd4f1e/fosaxutodozelune.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/japug.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/bulopasokatevejuxav.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/nanagusos.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f3559c9a---wufakufululesuxusogelubu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-15/20210915213243144097.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/52402816109.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/30917396695.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/keguzowivajitajuzif.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/15582594527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=romantic+words+that+start+with+rPDF link annotation
    • 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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 17348 bytes
SHA-256: b982e0da707f01caec9d995825349a52b91aaffdacb8d951c00d06df9f44958b
font_01_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 10588 bytes
SHA-256: f721a44ddb8ff565ee46ae4b159314d662579164e2e7a066c16dc1c957a8c40f
font_02_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1