Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead57b6b60bbab2a…

MALICIOUS

PDF

75.4 KB Created: 2021-06-26 13:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2dca0d67b1e2bcb6896506d44e2664fd SHA-1: cb2241ff7d12d36e80fd84e63d5d97875182bd19 SHA-256: ead57b6b60bbab2a0c09f8baf3e2f46ea89a50ab08a3c1ed67d06b3bbfed5d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ca745a39bf493eeec669812412fcf98e/zimegamigitugowapobe.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d9babc72db616220928f044f7ed59e26/95920660828.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1eec8c33k7uaghheaj667kqc3q/79915362221.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0763b1906dfb9c9d87b19932f53a4e57/66305522436.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pegewetijemujoxufopuz.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/zisezogamibadis.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c001a630a---wanupezasi.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/nidifa.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/564b21e1734f0e01d2e990c8554c4178/68100138187.pdfIn PDF document text
    • http://st03.it/userfiles/files/73182142600.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dumoxizi.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/dimatufu.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/96360676570.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/wekufubanunato.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/baokrfc2ra74g0u4gahsc8r877/93059051770.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cde531b4c---44415954330.pdfIn PDF document text
    • https://ksuskalology.com/images/file/kejusetegetiwiwipok.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863b664d6ff---wusatujavesudisozotit.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d260638c9a7---14338263970.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/47756776082.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63930a3782---44226794002.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609303b40a765---zudoripiluranupevofujoxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=feet+and+inches+to+mmPDF 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_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 10468 bytes
SHA-256: 0f45438bd820374b0d49450f2efa12b9e9bdcfbef5fbc432ca58b2cbde63f2b4
font_01_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16696 bytes
SHA-256: 1c5f5c09c704caeea2218158f96899300ff0fe87353c83083fafe1fda3c77189

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