Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b592e36b5478df0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 15:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0ccc81d50a767a5361bc9fe522aa93b SHA-1: d973f59a89721b612f59a2b0ecdba585df412865 SHA-256: 1b592e36b5478df06e5171a354f7a6638c547c523e48c4a3c2957b55142cacf2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs point to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=famous+tongue+twisters+in+english+pdf PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132160fb7284---vefitegedigavutalokunos.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/10796479564.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zunabinuvakakenexolagezid.pdfIn PDF document text
    • http://wernitznigg.at/files/loxel.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/nidiwovoneje.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346eccf0542---14712380381.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb5b08b41---jilejerigeralo.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/xegakeloteso.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/purira.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/21049997836.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ic2g30eu1qjagmvao18s0nk7ep/69411645667.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/51840409862.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/90071769929.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/81607347412.pdfIn PDF document text
    • http://fohow77.ru/upload/file/maliwowupebigolejawudinon.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/vodawa.pdfIn PDF document text
    • http://boldogelet.hu/media/luguz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135337bcb568---73247661929.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6c1620a6---9709717781.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/nuwagowagomafuvawu.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/pofokumirekugagijozumuk.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904204706.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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 11108 bytes
SHA-256: 0d3bcab9ec62b550e518f5718f73065899dc3e49f1f8947b68fa5b16f4d58f48
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 18520 bytes
SHA-256: 493df5b7edb51a3c56571236621c6cd961b94c86f7336359de1cecd3496f8bc8
font_02_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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