Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0ecae686e263f0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 15:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dfdd39e108d24802645dda910ee41638 SHA-1: 41de5ec1fd6a0134c6f90fd44daeab18b4739fec SHA-256: ae0ecae686e263f01351501501331a737bbe5bb20640c9c80738b51615326980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farms pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear user-facing content, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=kenmore+oven+c970+manual PDF link annotation
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/357ba4b5d4977e245d31c0674ccac1eb/jumokovumowu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/koxobuwafegabapoto.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/6860c84deeba1bd101f4000a5f5db7ef/kuserezonot.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/bonawipezizireradamavu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/31353bf13808beb33a377c1ae2126a9c/32928643863.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/ridumimiradodafipe.pdfIn PDF document text
    • https://costarica4d.com/contents/files/29696808131.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30bf21c7a---vibeworubemoforatesufoko.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nbdk8n0lc04nco32tdt6mc2q5p/32244371411.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f61eead---90259189956.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e968245dcc8---fowonafakipim.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210731044530_NzE3ODY5NTc5MDU=.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00265ddd33---defebevofom.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6bee7389763de56fd41d149dfce817a1/zivaxigekaxuno.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fekuf.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/popuxadixu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/dc0d25c5bfedb88898fe5b7db4f18671/8257433807.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b091ed1b---bewixaxurekebevavopepagil.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607199a4ce2b9---57276177258.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/84770146282.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8c40a81765f0e75466528ded357f4805/duvufus.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/igi0gbkk3c3uip27cqsbls9un1/novizupitujituk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 10532 bytes
SHA-256: 9b621e72714ffcac520bb5546ce547d047b3961614d64f93be61ea7484e95e97
font_02_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 18320 bytes
SHA-256: 5be5eac65ccee886b600b76485055e50853ae4b969ddc2d10bd6179674b60d4b

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