Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce50b1625cce23…

MALICIOUS

PDF

90.5 KB Created: 2021-07-23 20:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb1ff230f66226d777db704b20f44d32 SHA-1: 2090ba9571658bb9faacc4100781fd08f0a250c1 SHA-256: c4ce50b1625cce2340d3232ee3d92d84edefcdd8430c1c5d9cdf7a6f6ce78822
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious payloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9351a64e891f49f261516c0662c1ac81/ribanurunimoxate.pdf In PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/97508543311.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/89580167089.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/linonepu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2ed22afe---35079895991.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/pativosovunar.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733d6066ef0---70581912344.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e1fac94b---31317143362.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/11976658177f501fdd72ee7913df4428/gajezodubaxif.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e268b638195---66898794847.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/35213923868.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tubozuf.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/5433256564.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/59172158592.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/63112450994.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e976bd19727---51570899201.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/4tsu462bg8ggmthh5iedraepbb/lufekivej.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/822619945.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507080511_1283010476.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b810f197d74---22061505399.pdfIn PDF document text
    • http://lukinserv.hu/file/61278089292.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/xubitozag.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609239e73cb51---60014795385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=perio+chart+template+pdfPDF 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_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 17304 bytes
SHA-256: 44b1930f80f5d1ef92f9f6689d4d3b5df46bde1a106aae8aa250ae273a2ee512
font_01_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 10616 bytes
SHA-256: d420e3eac50e6517e15ea3ad1b9771cae4eb2be233f6bffb1e01ceef04f31b10
font_02_sfnt_off00014452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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