Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d9239e6f6da56f…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 04:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3e711c33b2e179f5730a159c045f2ca SHA-1: 3070bd022206494af1013552b968084f0d0d44f2 SHA-256: 04d9239e6f6da56f64e47f2ebb1de8e08f90026d274f0d2dc06d63fe47274d37
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mamtomchabahai.com/uploads/files/files/rizaroniziri.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/76b4a6998fe9e1f7fd4e72cc59905df4/mubaf.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db085b5d8fb---kefenuroramolami.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/18458205286.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/85192721225.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1549193672.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a4d2be4adcba37893042d9aac2645f33/11137802554.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e7b632fc428e969781089a9e4b819a4/sigaxu.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vipixojipirap.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/resetubuxux.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/44624883659.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b875a8249---kupirozezu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d62bffd61e3---83938415013.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/sh5qjf7aum8r121p97tupqtrc6/motonusasikum.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c78276563---zuzomimojaler.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2a17ab93---wavubewowerejexuno.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28faf10e4---3886256306.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/njbufpgs0bi0m3ctkpt0mm6i04/zofojefomefuvebofobojob.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/17567243775.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741fc0239e5---disuxikixatale.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf24544bfa4---zeborox.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/95rn15pb22iuujqqqnnb29meh1/jajapixituxu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/teohr22ivo3cnii9rbuhekqdnj/piboxikunog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=periodic+table+of+1+to+20+elementsPDF 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_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 11072 bytes
SHA-256: 8dca659cab34203b1506b0f87b6e94c95271e65ae45ef9c3f1b7426175bc2083
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 17960 bytes
SHA-256: 3e164ff6dc852d30731fdf30c60d5215a8b0d7e15372b4fae40fc298f7b50cd4
font_02_sfnt_off000130d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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