Malicious PDF — malware analysis report

Static analysis result for SHA-256 b114526c09afb9f6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 16:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4945a2d82983a6c6ee41e5932d92508f SHA-1: 2cfcd54e9d89ce02db4f8783a8c966f97021b264 SHA-256: b114526c09afb9f6600da48ad2a75efe19901524ef75be834aee5e910ccb1706
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sz-nuoyi.com/Upload/file/2021091810222051368.pdf In PDF document text
    • http://sujitonweb.com/userfiles/files/luvuredesejakusijexagile.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/52676187747.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d059115940---terolakobawuvabajeko.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/32892487822.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/xoruzeritonasifefe.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jajowo.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zoparakujumaselulitap.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/31501075440.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lawivenugavexujopapux.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/meredagonuxaxadakulowaj.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/fujugumeb.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/menudejevokuvelavido.pdfIn PDF document text
    • http://eva.am/files/ccd17478dfe64d29.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/52182724061.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/48176422104.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/rixugivuzexi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e2c222ca32ddc94ba870927b08d5c1a9/tadudivapokov.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e28d4cfe80f24d1055af46bb98286aba/82954837107.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/f3707f4018f62e59c5fb6157a81218d4.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/22709138150.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/34957614362.pdfIn PDF document text
    • http://metapolar.hu/tmp/jamivuzan.pdfIn PDF document text
    • http://master-br.ru/img/file/34636436409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cloud+next+to+firestick+remote+appPDF 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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 17420 bytes
SHA-256: 4573bf3f6afaf9931e4e9c7ab49550aa703052affc15bd6ec7f2686f792004e1
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 11108 bytes
SHA-256: 615091496a490c3db0dc112a75a0d8d5e1bd4adf40438e53c78b9ff5df403f77

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