Malicious PDF — malware analysis report

Static analysis result for SHA-256 848260a9570ad877…

MALICIOUS

PDF

97.1 KB Created: 2021-09-19 00:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 025a0e41eb2547099fb5960884dc3444 SHA-1: 3395eab40169631c486db3e13ee35ade2959cc4e SHA-256: 848260a9570ad877a6a58c9eb6c6456622eadb014aea94bba15c1a2de8bcb40e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=remove+annoying+ads+in+chrome PDF link annotation
    • http://cuacuontoanthang.com/media/file/pumel.pdfIn PDF document text
    • http://riph.pl/userfiles/file/29711022789.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/balizonuzesulesa.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/84237107832.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/zabek.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/nobepogokipogasesako.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/femawulukimesifug.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161307561b400a---39684204027.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912011333.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ee0a5c6e3e214bbce17cf4e3fdd3aa3f/56488586258.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/gekizimafenuvuxepe.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/268200337.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/542c96ad02cc4173fe7d11621e6225a7/werojafedosibe.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/34260635364.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/40910984049.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/tebami.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/pukinuwitavini.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/90211768731.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/zexukapabupex.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/21697642835.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/fugikolobi.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ralebewabujodomijoboluxa.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/merogepakida.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/56765361422.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_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 10896 bytes
SHA-256: 5d0a6905e71471340f73e8dcb79036df4aaf06062fc91ec37fe47627ffa5a726
font_01_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 19844 bytes
SHA-256: 96d005f8612db12eec166f9877ffc38f8e24c05b29e424022e9c3b1eebeb1c6c

Open this report in the interactive analyzer, or submit your own file for analysis.