Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed25afd41f7f20bd…

MALICIOUS

PDF

139.0 KB Created: 2021-07-13 23:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30bd24650ce15cafaa0119f98ad0415a SHA-1: 213deae4a0ffd18324d133370e9b7b9d9c4228fb SHA-256: ed25afd41f7f20bdd51d8ecd2dcc06c3a1e1024b30f76871c4766f98e4c688f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous compromised WordPress upload directories and other potentially malicious PDF files. The embedded URLs suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5cc2ceb9a3d7ee4943d479ed64390266/29945727637.pdf
    • http://urjabatteries.in/userfiles/file/mibimejibesuna.pdf
    • http://hjtech.org/admin/upfile/file/bujimuwuna.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210619031756.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9sb7u9gmsmgg944nt1nuf216bf/38016110308.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2182d13b31---lesurawobivakavezabamezu.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/4653272ea8facf8047a005bff29a581b/gagelusaxomid.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084415f53342---43194166956.pdf
    • http://alexhoffordphotography.com/temp/files/file/18511789989.pdf
    • https://agentcctv.com/userfiles/file/girowadi.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/goxezosofakedi.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rpc57qbkcnc4bu9ljipdeufhu0/82480990699.pdf
    • http://southport1969.com/clients/861680/File/2051936204.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a88c3bd1c---89147532673.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xebamumexatibibow.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b2b7601cb09d919ef4d39bc0e8d72031/ketaduf.pdf
    • http://heibldr.hu/FCKfeltoltott/file/rijuji.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160890ce6930b1---tawusemadurakopibope.pdf
    • https://art4you.sk/editor_uploads/system/files/42647533241.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aaed5eb67---44086536381.pdf
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdf
    • http://eotp.info/sites/default/files/fck/file/72387824661.pdf
    • http://garderoba.sk/images/_file/44038779509.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=haunted+areas+in+indiana
    • 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_off0001be6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE6A 16792 bytes
font_01_sfnt_off0001d67c.bin
7a1831f08b45b7b6f869045e50b14596b32788a3d77c10f027ccf1422f52fc97
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D67C 18380 bytes
font_02_sfnt_off0002077c.bin
a4313b90d078e6540040c979e4bb389a86c182046061df923a0280fd9b2fa401
pdf-font-stream PDF embedded font (sfnt) at offset 0x2077C 10168 bytes