Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a80f790d400a43b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 15:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1316c6aee7ef0e87679ba5076c32b63f SHA-1: 89cf688ffc10d29f6320620361b45b5f56068d6c SHA-256: 0a80f790d400a43beea42946d6581d7a1796a1afe04a516eee3ae63c41df2208
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://ryanoomen.nl/uploadimages/files/39389824078.pdf In PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/gomiz.pdfIn PDF document text
    • http://soupworld.de/upload/file/sukalenez.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e8c7b2c48005b6db75cce7bf56a3dad/nugofez.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/mufopekewenu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/regarikulugudumixoduwepel.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/66942513973.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986396374aa---36433801792.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607336383fa5c---32790536922.pdfIn PDF document text
    • http://195exim.com/datas/files/zemosubapazoru.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/v205ibc9587equ996ivh6ndke4/75205039869.pdfIn PDF document text
    • https://masihpt1.com/contents//files/wakutefadujatume.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/setawomotulatifivis.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/73934047660a0b2b64ec4a.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/25532609966.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/mijupetekefowoliwozip.pdfIn PDF document text
    • http://esistore.be/userfiles/file/mewaditaxudogokew.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609948d7a3fe3---turoduvujunedafobebur.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/71149864856.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/raravikegun.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dotokig.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/bepuwatibususukidebo.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/e8a6d62bdf8f418d0a142a2adde49ed9.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/52961991069.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/41796904013.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4536d966---19107702240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=find+the+average+between+two+numbersPDF 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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 11016 bytes
SHA-256: e9cdab7c07d258b2f12ed85d87e14ea448efc7a7698aeabf63644643a6816bfc
font_01_sfnt_off000105e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E5 18344 bytes
SHA-256: 42a67a8203d4a6bd4464343263dd8a20b9a5b4aa368d178d8b7f7a37e9436fcc
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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