Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3ecf9b66748273…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 21:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 17426b56b0475186fcae53e123a3c513 SHA-1: bd78b09d0f0ad6fd7d1eb8c57b159115c926e15b SHA-256: ad3ecf9b66748273cee78ec2f9b8b514bc013f0b4f073f744eb1b67934a05033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://salamino.pl/userfiles/file/58997160857.pdf In PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/namawutalovemamaj.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/wegov.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/31117303292.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/7498391502.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/4110905533.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/15059465969.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/94d39eb46834f0fd191ed726b9264d9c/32894237370.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/95833465955.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/zezinapugofoxoliniv.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/9906976641.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045a72311f---tepigoselijutapajafoputej.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/pedisivasimabalebufiwuf.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/pazivawimovulal.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/26702261203.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/libajazupakimiserevulumaw.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jejazobulijudufipapabulo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/b5i1in4gn0ch4mq9uhm6fmrpsm/lixotemobuzisakaxuxape.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/jimegazukosej.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/poseturototuvik.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/suvod.pdfIn PDF document text
    • https://ratosatu.com/contents/files/rubobogelalebetoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+a+knife+for+free+in+csgoPDF 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_off0000af13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 10636 bytes
SHA-256: 8f36e27bc01d3fd6100cf09380d0158b42180f82922e25ad7c4891bf3b08fff7
font_02_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 16276 bytes
SHA-256: f0efae66c54bac26b3b5b632487898c382311651a15f15469d3fa9881a5373c1