Malicious PDF — malware analysis report

Static analysis result for SHA-256 319e5fddd1b1dbf4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b83913c68175be5c70012ea0fdbb2d5 SHA-1: e47316fc86196ef4330afb7cefba0f1d9a645f62 SHA-256: 319e5fddd1b1dbf445d6941f70d7ab9f37415a8da2d2d089256558ffb4905bfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://st-ark.it/userfiles/files/mirujizeguzokozokeba.pdf In PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/79c17c560b9eee7f9af42f6cc9b0d04b/gufevarisizegutek.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/62278453000.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/82584984317.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/50825763016.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wevis.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db65ddf4f---89014958035.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/79926041047.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/89552823187.pdfIn PDF document text
    • https://krusomying.com/data/file/nisoko.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/xolimuvazugozamugip.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/12580078588.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/kenitavikipufip.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/sezojigupelagop.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b039589ed---45757565511.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fidemofa.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/losukitodewavopuj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e61aaf10---wipukafore.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/dodebawiwis.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/gapuxurida.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210911205121.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/72678512628.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/40712578852.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109050009121364.pdfIn PDF document text
    • http://markaoyun.com/calisma2/files/uploads/xenezijisoxuvipevezijob.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/konamamavotofonefog.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/fomupowalofozotuvalam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+find+recently+deleted+files+on+androidPDF 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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 10660 bytes
SHA-256: a7e873357bf69e246fd6000b131e6f2cc794a4ae534586ed7b0900081d2824f6
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 18592 bytes
SHA-256: 5f35059fedc7608339b300749ca03027c2247f9ca09163e66f5d0d414f610112
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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