Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7a93f9843fb977…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 04:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81057d98581cb28f8a1567dcc6a50f75 SHA-1: 0800bbf03ffa0c2b2d18426364a6faae561da572 SHA-256: cd7a93f9843fb97788d1f5095ac7913d92870f2a96b1ec620e3d3ef979092815
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aumnat2car.com/ckfinder/core/connector/php/upload/files/kapomorugunuluserirux.pdf In PDF document text
    • http://kleinschadenexperte.de/userfiles/file/2691108295.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/kuwowexofarogofemi.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/15747504923.pdfIn PDF document text
    • http://chikatere.com/Upload/files/75544459373.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsmsdk0jbf9bihp84qeki34agj/27623025813.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/41438658005.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrjhpanlr0h63vp7n9svvuq616/51557554464.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fab2b2589---luxikogikopoxedebe.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pefap.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/713764df528e0b4e59c955a22ef1fe41/warawaxalebuduvazowibes.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ee1a68fda305d25f51cfef01697bca53/bojuluwiwazuxumupow.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/litujodesu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/96d1b439cc736c70061b6574e2c9780c/vegoxe.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/xobugekojojel.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608668c3ce088---fekitaguvopuzeripujoda.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/17358306107.pdfIn PDF document text
    • http://asustainable.com/global/file/mujijiligokonogog.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8424d25a---51804454451.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b0219b9c1---zubirodewere.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wosogefobawil.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zepubipurovufolikegiwa.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/61101333416.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a66386b1893dbaa155f230bf40b83756/xilufatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=online+pdf+to+word+free+document+converterPDF 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_off0000c637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16936 bytes
SHA-256: 7c5bfc031625fea4252d8b2b7fa5838408dc770450a89a68cfd10786a6833dc4
font_02_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10728 bytes
SHA-256: 111d3b63bb7db863068d0857d66ad71983b1cb29c83b8d4e5f98a71e918a62b5