Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd46b94a931f327d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 09:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d483753bf5e8d0b224e4cdd28c37b28 SHA-1: 9896596ebacfd802c69f054eb4ac52cc4b247efd SHA-256: cd46b94a931f327d5dc00fe6b459629a3df3ba0338232e5a70839f3bc383dcf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=l%E1%BB%8Bch+%C3%A2m+d%C6%B0%C6%A1ng+2019+pdf PDF link annotation
    • https://gtselect.fr/ckfinder/userfiles/files/xapajubikulaxuvi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/23810507805.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/turipoxudipevifosonidoja.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/78492088354.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5fe6e442be404c983e6b821801ce130a/85682767298.pdfIn PDF document text
    • http://ore-processing.ru/d/files/71885778286.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fejfifmuthpkne47ev5brl0fkh/30669038523.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca121c18f---fepurug.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/10839802707.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/2783412223.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kepenisiguvo.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/60346279614.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/39776384299.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/121b0c893a507f6fb5efb7497de4ea42/fobadotebidezoze.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161212e882b73b---6632051510.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/kaxewibajevud.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a834485f4c5---xazevanetefufopimokobolud.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/965ef41293fbac76ebc9630a8cbd58d1/5883237770.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/xetexezetet.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/162334459680.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/6132316732.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/pewovitax.pdfIn PDF document text
    • https://hse.tw/upload/file/roxazasadixukesedigojew.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9585051bc3611c6020ed1fab32c4e71/zexifikanodojote.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/98911447559.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/23427799813.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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 11268 bytes
SHA-256: cf945ca8c1184b55b43b21d4255c3baaf5b29715df9dd369dc60a0cb0a2e0429
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 28944 bytes
SHA-256: d3d0e3d829a6e6fe15ca26d0a68b2f6298edcd589f5c584015fea4153584faef