Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33264751e10f7bb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 22:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abffd6a47a4c77fa2c5cd5a949f70f1c SHA-1: 1fc37b5d5ef81e1b79840903858d271fd97182b3 SHA-256: e33264751e10f7bb1367e1b6f69c3ef9e6045f8a72c75072a31ec2a21093e93a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of numerous embedded URLs, many hosted on disposable domains or compromised sites, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elearning-chemistry.ro/userfiles/file/58616256333.pdf In PDF document text
    • https://komunalno-vrgorac.hr/files/3850462041.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/253582r55rne5eeaep3jgbkgu9/35941591284.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/17631055551.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/fowajudofofav.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/74151588685.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6cd7716da---pelaxaxokife.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/91160375318.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/tubalepizotutikidif.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/79195029980.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/47691930434.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/47586119636.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/41333851850.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nazimabedazelubogutit.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/90638588209.pdfIn PDF document text
    • https://ienter.bg/files/bosidoxogekaxipiwilo.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/5777387461.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/882d54b21fb452709001d54032065315.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0493b9d676c48eea3f18e2f62493bbce/60804760964.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/794b5beb8e23428f2134a14e90194de7/69267404270.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109120831563154.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/pivafepililonifadekapef.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/dimelikos.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/14323253829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+recording+studio+app+for+androidPDF 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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10900 bytes
SHA-256: b23f9ff880dc7bfde6bc94abd076b72313e0f9ba5836a840b3630200f6356dad
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 17408 bytes
SHA-256: 16c4eb6686c0cb3fbde8c96f4bbd6eb9c28e83e6dd3390a8d671524a366f51c0