Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488230c244024d2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 03:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f37f6a99f8bc8efe9829ce1deaeddb5 SHA-1: e6e0afc801c006231d76efe61f861bc204be920b SHA-256: d488230c244024d231331842c5a6c655863becf25a8565f793429525aa1b635d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://autoscuolepintozzi.it/userfiles/files/36250805910.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/412b1614ce414e6cca8e8ecd52dac63f/negukafixodatixomod.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/318d1f7c4f3a0645dc1555306ae28501/40875390462.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/ruluragoxozekadizig.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/daspdjuk7i4pk6ij7pqp4s7ka0/xutupabaganegimilata.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/39179369622.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3pe0l1so6i64assn7dtkkqtc20/wibofosiligaxaluvu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c1e6027e2524d3396a26af466f2abc11/2400257565.pdfIn PDF document text
    • http://askisan.com/upload/ckfinder/files/91769760113.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/33jjgni3nn6ivlj6gmrtk2nt7c/nujalejumivugifop.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/lamovazivedefabuj.pdfIn PDF document text
    • http://robbes.nl/media/files/42263646957.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df0de02146ddeb243d6966dd86e7985e/numekonabedufapusabobid.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/18857551359.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/51354865886.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/fusojako.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n4ksc9qti5no9e9m9cgkov7k4i/14128420231.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/21205509454.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a1d5ada070f47d61ac54ea7e69225839/fagafagosisuzubefaxelapa.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/47561802166.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/repikapimunejolar.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/29904611306.pdfIn PDF document text
    • https://bataretak.com/img/files/file/99066261931.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df6fcdd539253ead54ffe29933417166/67960357744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=writer%27s+block+solutionsPDF 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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 19640 bytes
SHA-256: 1b1fa1bb0401b1e95075c14b5c49711aa2aa358aab548f89043457d59aa8994b
font_01_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 10420 bytes
SHA-256: d0fce757a13e4bfa019321f1a844c91da9dec76d93fc4e792e0e6a325be16ec2

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