Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf84d3ae5554a58…

MALICIOUS

PDF

102.0 KB Created: 2021-06-27 07:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc402e4b70d2403321d4e373e65d157 SHA-1: 61693b219880e29f7fb935e3a0a67ba12f38d018 SHA-256: bdf84d3ae5554a586c21d1128462e7efdd0271a326ad879b7ce7d87c9ed0ae01
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b9hqbn9nuiqj26u20iv40ikes3/vizew.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf85061204---2211524210.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc090f092a---tuxojosatixorumizebi.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bb640475be4dfdb5277b12686b5fc484/47664416005.pdf
    • https://riolospettacoli.it/filesUploads/file/penalesexefomiwopuwewir.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079bef44fa10---wegituwosefivokawifis.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9fb17a66fc6e0343db39d7d8b6374d9c/xejewupive.pdf
    • http://soluzionebenessere.eu/userfiles/files/57534318241.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160758fdd9b6df---20426365767.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b732a3c57---bawusazakagutaw.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609839bca039e---99318020292.pdf
    • https://balajihighfields.in/userfiles/file/xuvisa.pdf
    • https://agronlogistics.com/userfiles/files/54075398192.pdf
    • http://musorcentrum.hu/files/article/file/3275598662.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d5ae10770cc11d51fd350ca3d813a5/gijamojanoxajomowefuse.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160894e210d6ef---makujizubepanuroja.pdf
    • https://pabrikangka.com/contents//files/dafajilujawaj.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160776e13ec8e6---97778122592.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/291a2a69e2fcf426ae25d050ba130ea5/zolugagibopuw.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/58662914712.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609db99f840e0---91000025098.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=stand+up+fighting+styles
    • 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_off00012bb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16792 bytes
font_01_sfnt_off000143d0.bin
e08bbb380ef284e48ee733112b0b8aa85a7096f6179aa07722013acbfc043383
pdf-font-stream PDF embedded font (sfnt) at offset 0x143D0 10844 bytes
font_02_sfnt_off00015c94.bin
ac5a0c1073bc27d66c9eedbfa24acc63b3642be2904712b2500cab883c8dbaaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C94 17828 bytes