Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f0a7eab1c121ef…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 22:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0dda2d3aefb6d02e12fb329b377396ca SHA-1: e04ee913c96765323962d4d6aaf729c3a70ea21e SHA-256: 33f0a7eab1c121efa27b53048616324cd75cf01205cd4d898230c4ebf88a637f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers and delivering malicious content. The PDF also contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=the+diary+of+anne+frank+excerpt+pdf PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b4dd9db0---19332597926.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tebozumuvenexuje.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/bibanapudat.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/21039049538.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8c916d99ec5c2b8fff57c7362e735e7c/vufefe.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/vajipovapavimasevexazato.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16115364093970---zixapazoji.pdfIn PDF document text
    • http://iwishop.hu/file/73907895864.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zabukizaxoxuxiver.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6505223a0bb571a77d9b7fd38a9ad339/66522547940.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/webitevurediragejoporogon.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/63958368058.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wigotovawuneno.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/735a2a524cb00fce89ed153afed149e3/solififuten.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/56de4b35dac694aa1c75e0cf2ee11b8d/mexubifiboworojese.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/77834560230.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/viwifotabax.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/kejubulazokubudox.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nonikujozetiw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608469c7e759c---nopixuxoximuvotomotuj.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/kusotumojufamev.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0df3ccc8f643126328cebb5f78d524cd/ligonafasenoloselofusewu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dugafinotokafafujixe.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_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 17860 bytes
SHA-256: 2d6aaba99cd38b7c05a52ddfd9bd9856662c0a0bc7bcb9ff422c19025bfa91fc
font_02_sfnt_off0001490b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 10776 bytes
SHA-256: ead70e9274ea06da830accb5692c185e7a294ca37a527dbb989bba11e34afd7e

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