Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff2d3260d534cdd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 04:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d70130a89127ba9c92a001130cbe37d9 SHA-1: 07dcfe5f2a31bca694e7c4de59d9820dc4392a8a SHA-256: 8ff2d3260d534cdda694355e84bce98c96ca6effc061ffdc22cd9d31d06d2674
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=watch+queen+and+slim+online PDF link annotation
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/i1lfihvik9vmv9l7ko7u4mim44/razisanemis.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/66030410999.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911141434.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/sajanifinap.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/20470627552.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109052206399240.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/55316666601.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/75184388182.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/2464129716.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/dexuvat.pdfIn PDF document text
    • http://domario.ru/userfiles/file/47961328485.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8f8142ee9f7707d8e8a0197df3032ce4/nenuf.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/75429259928.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/poxavapasanatusama.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/86961333833.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/12584014879.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613517a82c088---nexinilerimusijelozolem.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/5920007870.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/24394476785.pdfIn PDF document text
    • http://datcat.vn/2018/file/65938038625.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/88106126524.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/86733350385.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/32273391156.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_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 17844 bytes
SHA-256: 922750da89dd058ef00ef37e46374f82cae55a856d6de63370657fc619aa92a7
font_01_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 10772 bytes
SHA-256: 74011c6949346f64c446d514bf4176ba4290dd281c843a727587253dcae411ae
font_02_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1