Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a6139438df14ea…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19eeb8b40baec43a0b35560589622ebc SHA-1: d3146fe8001b97684b5f110927a211b55b3b81f0 SHA-256: e7a6139438df14ea3ea440ecf2aa89e904bed60f2b47df843ca085ab848fcb7f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the presence of external URIs and a link farm pointing to compromised CMS uploads, suggesting an attempt to host or redirect to malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=vidmate+download+latest+version+apk PDF link annotation
    • http://herborgthailand.com/file_media/file_image/file/29681718503.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16146fd5a6ddc7---77747775227.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/49548868835.pdfIn PDF document text
    • http://saaretravel.ee/images/file/44222840403.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/56b03ee27b5f4359d94895bb88cea274/75515103339.pdfIn PDF document text
    • http://congluc.com/upload/files/penile.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/wopuxuzid.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/mojolel.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109101247502080.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/waruzododup.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/15747326011.pdfIn PDF document text
    • https://robertbah.si/files/file/51197433125.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/44736155320.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/zumar.pdfIn PDF document text
    • https://cecprint.com/images/file/82273268747.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/lugufexosarakix.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/denikitumavederovar.pdfIn PDF document text
    • https://85097781.com/upload/files/zetovedazipove.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/42180216643.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ur25h4mclj52blm601k0n10m3i/pafexeriju.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/kudenoxuzifuxaso.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/54817431190.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/77101936430.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/108534295.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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10768 bytes
SHA-256: 00aa7c00fde44be3155f7413c89514466d6db9b72fa0632942883cc544dba24b
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 19316 bytes
SHA-256: 3ed92678e859004f06972950665b992f461b0afff91f4f749b05138b1c09eb82

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