Malicious PDF — malware analysis report

Static analysis result for SHA-256 4232433e66f8e2b2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4381fd7e233e4b0cad379c3710a46253 SHA-1: 34c48abfa220c10af42886a35b06fda5f3386ab0 SHA-256: 4232433e66f8e2b22010c4f94061dc77d0c36ca0861394b330f2774e5f4f2e57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or compromised hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=lone+wolf+2+android PDF link annotation
    • http://ccsl.asia/files/51690957695.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/lefobofu.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/vafafik.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/gujitamewadinuvejuwubega.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/62797258585.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9adf751992736ca057d3d28bf0036a75/wexozetepan.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/18154759323.pdfIn PDF document text
    • https://shunnasato.com/vorisopuxinawasubowaxurod.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903224634.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/dilebenalatomozinabede.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/guzowewulopibugekorumesuw.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l8hfpmfhrprrgejb28hkben3bj/77194714358.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/safolemomixixuxozajezavun.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/xudedu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ee6dd7c6a0---josoduvekes.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/39729045471.pdfIn PDF document text
    • http://e-sheremet.com/img/90691966621.pdfIn PDF document text
    • http://santehnika34.ru/images/file/lumirasogolafakij.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/68227119116.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/jidasidawi.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/38803686212.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902203620884.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/35158414540.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fuxitagewipilagotigusoxux.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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 10244 bytes
SHA-256: 8f18e8f2748f42de206cb863ce2ded04bc8e90f73a9a78a3191950156c29a090
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 20964 bytes
SHA-256: 1130883dc528d9bd864cc72ff3c15c8bad3b96c8ec200911b885549a1a43f5c7

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