Malicious PDF — malware analysis report

Static analysis result for SHA-256 999cd14af5af4bc8…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 11:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08c47d94362008c1014803df54388834 SHA-1: d5780938125c4fe005f6c50474931440b5937c6e SHA-256: 999cd14af5af4bc8896e50f222402a7611c72d6eaf21a006b8c76227650ae99e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=epic+seeds+for+minecraft+xbox+360+edition PDF link annotation
    • http://fujieshubao.com/zk/UploadFile/file/2021090402115973499.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ce3db16466ccefe8cd193579b80e6c9f/zijujizevumefavesibax.pdfIn PDF document text
    • http://iringmalaysia.com/ckfinder/userfiles/files/35969595101.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jegugunujef.pdfIn PDF document text
    • https://mashura.co/userfiles/files/vekijelenudufiv.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/67762383901.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • https://majubesar.org/contents/files/vojiwukib.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/gedelidijigafijulew.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f9505f0c---rolewofapalenidon.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/21368225395.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/40768861249.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/doxowat.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b56ea84ea---jovajajiweke.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/96484644240.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuxutejebelopimugixepuji.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130be1793ca2---tafaxezonodag.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/sejasuxopajiwazozunozu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/godisazegakibelepubazuvof.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/4883780515.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/delovoxepijuxa.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudutowari.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386bb92ea86---26472958195.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3looem1lhgnhiirf4tcv48v4t9/bokezitenugizuzeju.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gejaxivuxakawif.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/60923960013.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_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 17836 bytes
SHA-256: d20c357194c8dd0249741c6bcda3bb3e920930c66b452895db18c46e405b2044
font_01_sfnt_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 11420 bytes
SHA-256: 79fd8ea4663bcd75cda4a7d380a74c1e09cbf63f501261b43f96a75bdf87af72
font_02_sfnt_off000133e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1