Malicious PDF — malware analysis report

Static analysis result for SHA-256 d720f23f37fc826a…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 04:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c6a7162a06f26c897e8eba12c96853a SHA-1: 3d71d57a44d449e3df7b62aff98801bced14bf66 SHA-256: d720f23f37fc826a1b2bed5b16bb35661873e69ab7dd9ce68f273ea7b047244a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2b276e787a9c65f4bed99aaa124c3c0/tadodapefivasige.pdf
    • http://animalscipublisher.com/files/upfiles/file/bafobevof.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658a1bdfa5---xuwexivuvaf.pdf
    • http://ecohouse-lab.com/userfiles/file/51461421836.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/98b6969c98b27d4eba2f72de9ab90dc8/41600491837.pdf
    • https://samsungdvm.net/upload/ckfinder/files/4535290068.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c07414507df---kijidesodabifivajevezuno.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9smk7566uq42rs4r48pa2hfn2e/kevuna.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/60j8pj9dsatnsdo09i04reho50/91418279512.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e9305e2a---70685541516.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/fojoseb.pdf
    • http://93564497.com/userfiles/wifijid.pdf
    • http://cnokorea.com/userfiles/file/gabagilerug.pdf
    • https://transmar.biz/ckfinder/userfiles/files/49542063648.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9c955c505b72d6589750dcdfb6a56ef/41949164353.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9538ba81791bb2c2b88dd9e6d00a1fea/pebeg.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/328784a2f1b182e77703d731817feb42/bedezoluw.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2103c9a9b6---pakika.pdf
    • https://kientrucqhouse.com/uploads/image/files/losologesemunu.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/kowabulekaxapuwawiwara.pdf
    • http://bettaletroom.com/file_media/file_image/file/58041829227.pdf
    • http://escqatar.com/uploads/userfiles/file/file/97403848840.pdf
    • https://rumahbaruku.com/contents//files/78106128790.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wife+being+shared+with+friends
    • 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_off0000ed58.bin
918c9708c632651045de7cc70d8785d9960303c664c26f9b96b4d7350eb6a45e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 17268 bytes
font_01_sfnt_off00011a5a.bin
d4dd80790e57ed402ec950cc8d246ea6ce16313f2d3e763393dddecc26a9a598
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 10688 bytes
font_02_sfnt_off000132ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 16792 bytes