Malicious PDF — malware analysis report

Static analysis result for SHA-256 adec459cb19e319e…

MALICIOUS

PDF

94.8 KB Created: 2021-08-17 10:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cdc0e3a4a0b78eaf59b47054469c4531 SHA-1: fb4b7416b2b51d25be6abe20cbc8f0def7dbcffd SHA-256: adec459cb19e319e3d6f8450c7a0dbd3637d5ac5ccd8ddde2446609727eacec5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • 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 http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ce0a8e78---60486070427.pdf In PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/51354817636.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/novigozumobozeromidus.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/purofigogafoxijupebi.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6618c87f---67718218685.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210815_808FE21B8259D462.pdfIn PDF document text
    • https://emmaushuis.org/pages/73195126976.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210627080145.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed763d569e---pedaviwasuwijejolebodoliz.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/8696199514.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/3715326577.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/jupodu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d32126bd7258f55aeab145657e0a6cbc/14727350821.pdfIn PDF document text
    • http://kasargod.net/uploads/file/siwedekini.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73687278586.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/vapinopewegozamile.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/19aa4705ca69049945e75a7ad223c56c/bimaxasumidakolewetixa.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/jorunajexoguz.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/vipevejejuzupegilonux.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/dasaveboxaxatevekovodori.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708867a5032---tujubimedatufunatoni.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96101de06---97516624145.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/kimaguzivokawevabe.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b25b63af330---vubefumoloxututubipo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/fc2766bb7b546807fabec1850885c028/69746728069.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/d0ceacac065273fb280a27f1533955a7/62618987743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gb+whatsapp+apkpurePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10444 bytes
SHA-256: 219bcea48417274583f367c3ad62894ad54c2563b881523068b6fe36ff566137
font_01_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 17408 bytes
SHA-256: 66df07c67741bc4ea7c867acf1a922bc0d26fb31ca1d00d85fa63bd842a1169f
font_02_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 16420 bytes
SHA-256: 90e009cff8254d069b7782410d50a3e584cc77a56f3be479151752ef3df1a005
font_03_sfnt_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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