Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9c5dc799f94fb5…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 03:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4cef841c7b517c67adcc6550eccde246 SHA-1: cc651874c6009eb3e9be6d22275ffa828c675c80 SHA-256: 5a9c5dc799f94fb56eb88e46d1ce1cd573ad5358ed8b2f8e994ead2025adb161
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://synerhu.ru/uplcv?utm_term=bauhn+wireless+headphones+aldi+manual PDF link annotation
    • https://brakos.it/file/20640618090.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/9e61c3d7bcd3f9e370b91c02d21f2eae/donupafegofabavadabe.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/36488947217.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8e9212d45cb566ebf3a785e44a4fa218/fodejuxigogefukivit.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/48814935564.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/55620347230.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/53144883734.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/29064831022.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ivjh15iq3cpj65dleka50iki19/jarowatobifenegefizoriwed.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/20339478588.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rabafakurokoganepelug.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3df65b69ca7a5ced3a97bfdab8342e26/84327212907.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/dlorflihomurssg16fk9s0l64o/zevazakofej.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/67073656312.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/supafovufurakuso.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/gozisubawiruniriribupazo.pdfIn PDF document text
    • https://atiksigorta.com/files/soxebevagolob.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80c9c34fd---40851471070.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/sumalerivevexof.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f79746042552282e81a4634e8c1e22ed/5281255832.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/88011218748.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_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 19356 bytes
SHA-256: bc0dfc9f0e768f102d42a82dbe8378272f864c1dc25501e3541d574940f60079
font_02_sfnt_off00013fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE6 10796 bytes
SHA-256: 08197c370c9a7444b2f90da5fce3ceb84eaf185d4bf92ad0175c9cb07a04bd72

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