Malicious PDF — malware analysis report

Static analysis result for SHA-256 2096872ac73447e2…

MALICIOUS

PDF

79.8 KB Created: 2021-08-02 03:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5ed9b5f2e7afe01b3d39e62bb23c5b40 SHA-1: f3755b183c5f497c99bf843ba9b361da44018338 SHA-256: 2096872ac73447e212db030f3ea2d12bbdbfad6a8fa85fb1f8eda83af574e2c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or link-farming attack pattern. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=how+to+reset+my+ac+remote PDF link annotation
    • http://yonseri.org/userfiles/files/sepiti.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083c328e5fb5---44344804153.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/96847887402.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16240569510779.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d9639d2576732ee0df0f77411721b602/48933453818.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3g5j7snts3am9sedkfdm3gu7kj/42212642048.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/nuximaxavokuwesufazux.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/030704021203.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/74125978196.pdfIn PDF document text
    • http://raczcsalad.hu/files/90337080478.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/6508519073.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/45592927067.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc713b7a0ca---vevitavege.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b68c274dba41a4634122038925cf8cc4/94128815947.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/67033947607.pdfIn PDF document text
    • https://irrisyst.eu/files/file/ravorudutunib.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/tilisiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a75c7a54---joxipuzezeg.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e4f68173---66356446873.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/54897629648.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dimomexe.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210723184505.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/domatededi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d56qikc4lte5v52pjl4ngcjgu1/62368958041.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_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 16632 bytes
SHA-256: 08ecdfca04de18e5a8a34f20f3f2102a2082695662d86ce21e50599f402bde30
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10340 bytes
SHA-256: 77be5c00fafb5d201ae69a99822c96b5e22ec2ee29cf359cf37edb068cc40986
font_02_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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