Malicious PDF — malware analysis report

Static analysis result for SHA-256 84eb27eb8f185df5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 18:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8e0b22f5263061c11e0a1220316c036 SHA-1: f6106fe99b24f831dcf02ab44d5d79bdd88947cb SHA-256: 84eb27eb8f185df5d5d4eb890271b456c4cd51f247c9e191811decebaa67826e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document impersonates a cloud file-sharing service, a common lure for phishing or malware delivery. The embedded URLs and heuristics strongly suggest the document is designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely exploits PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://smidgel.ru/uplcv?utm_term=send+picture+in+text+message+android PDF link annotation
    • http://sobateracota.ro/mm/file/vowuromelew.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/legake.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/57233209163.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///20219161233541373.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/gidazidositawesodizat.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/bavopogalusuvala.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b51dbf14---82689887788.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/46580102179.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/82647477061.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/11296087940.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/10634293149.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nurufovodusajezifi.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/69291692697.pdfIn PDF document text
    • http://hmed.vn/upload/files/nixigunelapenatan.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/96829512148.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/tadopebopazitolorub.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/90d4b213a19ea8d860678a4aaf412220/disuzimavilifulezev.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/lavuzupovobewu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a2a1fbc4---xifelebugubujexuze.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1b9a87c3c---90110104589.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/ginukemokari.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/numuvuvupinet.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/nonegokexubuwonezurolowus.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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 11088 bytes
SHA-256: 4ac76d3c5ccff88903ed4d99f667be92ed67dac2657eeb56cecb6ca2cde77d98
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 17780 bytes
SHA-256: 242bccffe2431df8d8682cba08ba6ebb9905958631e4b74d2141f00f8e5e9231
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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