Malicious PDF — malware analysis report

Static analysis result for SHA-256 335c4e97993780d4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 16:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60b4f875782305a707fb9ccf8989a3bb SHA-1: ebb17a86e3fc7e6c22d8ac0b27d8f2d68f4aeda3 SHA-256: 335c4e97993780d4ffef69e61e72ab5e36281e6ee2f5671dff6c2e0f9c6e5b5d
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, which are common tactics for phishing or malware distribution. The embedded URLs suggest the primary goal is to redirect the user to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://eva.am/files/dd3843d73a3c2a4e.pdf In PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9djuh5qj7727q1i0ip3ntneqcp/17748633633.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugelunaniwekoxafimoge.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/62569142307.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/pixavazejejorozokabitodo.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/25153313475.pdfIn PDF document text
    • https://zzwgjx.com/d/files/38976796388.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210720193222.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ebba8e2ebece31a3f287702cc176f37/67099649109.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c385330168b18d8870c5cf2637b3e236/83327315188.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48351956901.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e032b4890e---48611056259.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/wisoguwuju.pdfIn PDF document text
    • https://southafricapools.com/contents//files/81718600457.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xusokoresimewufebaxi.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/tizorevewubej.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/52656258521.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e020f2b2d4---jexedugegiwavusulobij.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/224f14f201186eaa7f9bf0ba93428ce3/resusaxuzorijifodoxaliv.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/62730411111.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qk7euhu871cguepnvme0cde2pq/fubibapokonezitib.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/8545697585.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55f9ca208---18459380976.pdfIn PDF document text
    • https://ivaco.it/file/lotesogedugapogosagidiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lol+adc+guidePDF link annotation
    • 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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 10132 bytes
SHA-256: 88fa7eb855e86cb356203211d7b9fdd0bbf51a4c869ecd6e33bb527e3e041824
font_02_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 17316 bytes
SHA-256: 124fcc8042ad81298c54448844b2cdb6cc23438c547d6179af9c027ee50a143e

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