Malicious PDF — malware analysis report

Static analysis result for SHA-256 1273aa1f3f2360b1…

MALICIOUS

PDF

84.4 KB Created: 2021-10-10 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 86d0fbdb68e42fa6be4173aefc15fb20 SHA-1: 1ff21114b023ca50596a199184ced8d342b0dc9b SHA-256: 1273aa1f3f2360b1e1e91f816e7f6a1a8c131671a41c369e1a8de3c9630c7f6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to external sites, some hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for achieving this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/nebulagoz.pdf In PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/79101557098.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/44723036301.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/28632176884.pdfIn PDF document text
    • https://jss-moms.si/upload/File/vidojudamiwaforome.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/54504092739.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd8e7e4db1---renuradudeten.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/kuguwoforaxij.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/nowagir.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/vegamozirofamumew.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/vogere.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/18124708925.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/865f0737b6b71efbfab04ac9ecc4b3d3/regatuxuxixajotakutewu.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/62928233602.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/54996840111.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/dewexuguna.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/kerosakojubevor.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/nidetogusujoveli.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jinoriduguzovunofalol.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd17a1cce---68163004019.pdfIn PDF document text
    • http://placc.info/up_image/78292898864.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/67137531250.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/36556151951.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xomofiverukudiposazida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=you+lift+me+up+where+we+belongPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 18888 bytes
SHA-256: d4c028b67d045e8ad7cebebdd1c3385779c6de060b9115ca99732b8073816c6f
font_01_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 10784 bytes
SHA-256: 3a2abb51ae8c2e06df9ab0feec2af0a5b3a129f4cdc37a56a8faf5c6628f1b81

Open this report in the interactive analyzer, or submit your own file for analysis.