Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f78681c51252fe1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 12:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 92beced156348451dd48d27932ab2771 SHA-1: e6bbdd19a2271370a1cae7260b1e36687085932f SHA-256: 5f78681c51252fe10470251566d5ebbeca4e4c29e668310f51ba07bb8ea4ea74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded JavaScript, detected by heuristics and ClamAV as a phishing trojan, indicates an attempt to execute malicious code. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://studiogiamberardino.it/userfiles/files/50401767385.pdf In PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/migojeva.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/75940114731.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/71154213855.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/galesegazaxalogipawiv.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/gewipovimara.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/93898976704.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/nojafusugeta.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/2422428944.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5c3fc9260---92058902324.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/delotukidu.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/gewowimapixetatiguka.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153ae3b007b5---98964402694.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906155357.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fde56ec165---72623562061.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109070628055016.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/85788804345.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/davox.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/67716011320.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161509032186d9---3773384521.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/98984992282.pdfIn PDF document text
    • http://totoumi.jp/upload/file/bobuluna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=control+systems+engineering+7th+edition+pdfPDF 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_off0000afb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 14440 bytes
SHA-256: 02652713efbf4fedffa6bc9b9cd19ab0955b40418cf26569472198b06e962649
font_02_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10976 bytes
SHA-256: 92cc1524a586b8fd2dc4e4d85f06789644ed59d9141d859307a3215ce2832a78

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