Malicious PDF — malware analysis report

Static analysis result for SHA-256 8859753e77cd0fc7…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 12:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d08b06f1880175d00eaec050171397c9 SHA-1: cb5575712a55d42fb9b7cf08090e323e1ff4bb56 SHA-256: 8859753e77cd0fc71d99afc622058b6362bc0494864da0f220d1e6eed7f50c33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites hosting further PDF files. These embedded links suggest an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the overall structure points to a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f0d6bff118ffbf22022f87684d4e1a32/fazugajufuxaruzipufeput.pdf
    • http://www.srijonihealinghome.com/fckimages/file/bulutunopoji.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c6124c3d---34551063583.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dcmadvj8pl0r4k44cb9atg7837/sedatasegivesuvosubo.pdf
    • http://www.klimavill.com//data/editorfile/33765343002.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/a65d0386212a089ee25fef99fe161863/mejefov.pdf
    • https://niboparis.com/upload/fckeditor/files/lilisewe.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/48879063436.pdf
    • http://thamdinhgiadaiquang.com/img/files/43606033726.pdf
    • http://banphimchuot.com/userfiles/file/7436952176.pdf
    • http://ngor2-3.com/file_media/file_image/file/sulodumetekemi.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/693ceee53b07c278b92cda59f4e7cd19/zujirumumirisem.pdf
    • http://gayaarchi.com/userfiles/file/20210526135825.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce11ab12b4d---49445595919.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c852dc911e9---mamoromeviruxoxam.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d61ea5fc---41200757625.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748b82c977---18994348877.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b8dc37b073660fc3c839592e310b4949/konurutumazisus.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069612674e---63207717910.pdf
    • http://keacg.com/upload/files/zajovewegojo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf5a1d5d2---kalefumekeforaneki.pdf
    • http://geteffective.biz/uploadfiles/file/putipelapikonumufepa.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcfed41b5---wugotagobadupite.pdf
    • http://residencecarlofelice.com/userfiles/files/22358269569.pdf
    • http://washchienluoc.com/upload/file/24135977175.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=owned+up+crossword+clue
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin
d03c9658f301d23a381896c45b7662cb0d9a803bfe613778eddf2bf6a159d450
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 10368 bytes
font_01_sfnt_off000105c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 16792 bytes
font_02_sfnt_off00011dd3.bin
bfedcf3fced9d1267695f85cfaf8610def5379b0e227e57fddbb0fdceb17b55c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 20120 bytes