Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abbb8829099c2f6…

MALICIOUS

PDF

83.3 KB Created: 2021-10-22 14:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4502f83787f14a7a5c4abb61710d0686 SHA-1: 2fabc77e6040a06146ae9c94fe4089375532b1e7 SHA-256: 7abbb8829099c2f6dfe6f973e043d0f51b43b1f96d9dfe753ae63cf9c1f5d8db
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://acrgroup.nl/userfiles/file/74685959135.pdf In PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/23501739653.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/2894059121.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/52663594808.pdfIn PDF document text
    • http://ducnhua.com/upload/files/62462797450.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/renitumapi.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1632380991.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe9262cf3---43495549416.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d45ab8b1bce87330e5d987397df82cc1/58576508541.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/85192677334.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/telowese.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/63283687935.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/mesalorijufupovobakugosu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d740602a---wawunot.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/jetirosajat.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/12288397334.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/23272805248.pdfIn PDF document text
    • https://dasyueshan.org/userfiles/file/fomixanofulesanige.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16313106887bcc2c7c6c4813425267.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/37042945022.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/vumebofegijaj.pdfIn PDF document text
    • https://ferropula.hr/files/rolodanoxozedojaw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=cosigner+vs+joint+applicantPDF 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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 18348 bytes
SHA-256: bd9f58d2446f1c5b40d76ca3ab5ed4907f1d812c47d9db2ef100a1c2cbb99e47
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10776 bytes
SHA-256: c2c00d3de3377c3d06e33f38068ed091107f55a930c8cea333aa7e52f093909a
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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