Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca39f815acc2dae…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 19:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01d249e55be67b011c101b00f24ae601 SHA-1: fe6de91ef21884e7916e7a79b2c64caddf02ffab SHA-256: dca39f815acc2dae1550adaa232219be2e90e26b960fbd19db8d9f19f2e18edc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=gigaset+a120+instruction+manual PDF link annotation
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3d4d1e4b422d4aa1bfd1f13600907fc7/wajirinidosabi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c9d1c03ccb014dc56f4e8088d24dd390/mekudosozitez.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/jutasijifivot.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ad35ff34d602aef7ace4281f24d9fb08/jexigenivek.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/67432091865.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/jelobakududebipakaf.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/mesijimokagibokevelexolov.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pirugoveli.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/fowizogobanetanazu.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/xedodagesu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d3d76a83---4785020175.pdfIn PDF document text
    • http://msiutilities.biz/documents/gevobamufuz.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p22f3pqivsrle2g3d01u8oajs3/fovedegenenosowatomed.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7206694055.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/virovo.pdfIn PDF document text
    • http://flomojapan.com/upload/files/94716412360.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/rulimotipo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd33905d1---363123778.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/dojujoturevekolov.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/liveroxezamalafuwogiponu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210521131354.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/vatakiwojijekitamad.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074111cd4cff---15984761909.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107fc989852e---69023807391.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_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 18016 bytes
SHA-256: 0fbd7097c719d68faa14cafddbcf0c12d5d1bf15a628611d5f94c5a9796126f0
font_02_sfnt_off0001157d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 11004 bytes
SHA-256: 7e298d587ce8402fdc50f0e0eb3381185a065609db5937aea345d4c9a0fda3ba

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