Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fd6b40f734eb17…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 17:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32d850a0a9851fb3bab681a34f105ee9 SHA-1: 769244e03c21f709bfe9f1f3812abba7c6fc358e SHA-256: 66fd6b40f734eb17d77c9cf726603cabe4c7101d80e14fedbab75c4e99c64e9c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://songhandiban.com/uploadfile/file/2021070708495273499.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/gogebufutidib.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/d920d3eb6f4bd137041e760f50266914/53469548500.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/xodoburumegobunakabofijuj.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/10c4b263d870bcc5f3022c19ab32db8a/safuvokuwikeso.pdf
    • http://debsecond.net/UserFiles/File/jerufamimimovusuzobexuma.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1e2993a0f32f9d4aae58e349839e9126/11941370580.pdf
    • http://waberry1969.com/clients/877040/File/kajizino.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844d3ed984---taniluwidirikisi.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1h5d6j0j9joi1s87qc3n398f7u/65762359072.pdf
    • http://thaide.org/userfiles/file/16494674346.pdf
    • http://deasreunion.com/clients/860224/File/17978501880.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c380d0aa---butaja.pdf
    • http://alumcity.ru/userfiles/file/83502029188.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfec34e8d---20961852369.pdf
    • https://bio86.net/fichiers/konigexufomavisezenas.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2969c849---4990330111.pdf
    • http://learnersdigest.org/userfiles/file/87164438169.pdf
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/49387414767.pdf
    • http://balone.net/_upload/file///wokukipanel.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160daab5cd727a---sobaberazadasesepagujoj.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be25d7ca48---fewuxajipoburexunigewew.pdf
    • http://tomaszfilipczak.pl/userfiles/file/tiwit.pdf
    • http://arch-teh.com/pic/userfile/16693967509.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb209a970f2---pokebofaje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+life+is+in+you+lord+lyrics+don+moen
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf14.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 1692 bytes
font_01_sfnt_off0000d71c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
font_02_sfnt_off0000ef2d.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16160 bytes
font_03_sfnt_off000104a2.bin
a038faf5d5647735ae67ad0a7f55dca07b59a6dd894978a182b9ee1de314c447
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 17188 bytes
font_04_sfnt_off000131d9.bin
21a4e2bd17f859e2b67fc781faf911576235c1f57a1ea3557dfa37adfbcf619a
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 10584 bytes