Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2210b65985e273…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 03:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44b6d81e3eeb8c96fdbe086721d12f89 SHA-1: 4ca994acd4cab7c4be97d2f86c32785794aa6f14 SHA-256: 4f2210b65985e2730bd09799fd388cc39f0a9570dcbfb8753c38df5bb3f2bdc7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5nk6kj17m6eiov07darbepq0an/kajosuvaputaxoxoju.pdf In PDF document text
    • https://adikketiga.com/contents//files/nizojukelem.pdfIn PDF document text
    • http://allcondosales.rodeodrivecondosale.com/userfiles/files/tumebin.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/92372734493.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/sisipatuti.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/banajasigirifajijuza.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7g07p02qlei69lrd9o4bmeuva2/puxexefosovuxavotixoxowiv.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf31f2ff9---vedilebol.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/56458939387.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/58297126636.pdfIn PDF document text
    • http://handgun.ee/media/file/83689614397.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/64848717319.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/35218902343.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/80383734324.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210701_220847.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b567306ce02---58942464834.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/4919801469.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/nepovajenalopis.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082daf8a0d50---korukolukaginejalufawo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/25182816997.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/xuwepekure.pdfIn PDF document text
    • http://chenruichem.com/upload/files/gokuwoxa.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/fagonazaxagekixisox.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072666271d48---mubalosijulopoposijumuxi.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/rosomol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bronsted+lowry+acid+base+examplesPDF 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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 18220 bytes
SHA-256: 651b59472ec13cc27d1783dd46439a7f7739d0e0a16db2ec85b0636ccb4915b4
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 11172 bytes
SHA-256: 1f2832a4a29d2cbf5d10e75b971dfd1069a62baf7f248e500e802ae9ff37a90b
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1