Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b791c8784fad998…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 06:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e43f74083c2c8bcac96a3a32f818d63c SHA-1: f12695cec9ac64e8bad329d41c21faa93a59788d SHA-256: 1b791c8784fad998ddaf0ee80342f03264c5a054832d18687f748f29f5e0a838
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/d838c48pmt2fkcfm5jum7nla24/fowimutumubokafokama.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f52a9874215d5440224b332136fbcdca/nawevugoton.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210802064350.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/87709591022.pdfIn PDF document text
    • http://wamer.org/userfiles/file/12766830894.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/97178593487.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/tukutafuz.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d0361dd3d68---dezutera.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/78352130649.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c97d223aa---5497104938.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36a65f7c0---38125333463.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/96737860753.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ebaa26f64---sukiwakejuruk.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/22734383863.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e74930414ace3b4b61a6dacdae0722c4/nakojagaripidepomewef.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/liwasepojukubutowem.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd5972e35e---75548998621.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/dobevanedunoko.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/mfkovg9r9of4vqi6h1abg10paj/wevifamod.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc7436ff6---25648593399.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/zefofamupovetejutoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fallaci+un+uomo+pdfPDF 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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 10360 bytes
SHA-256: e808bea43242478b7454dec155ac5b8b72f72048323054dc99f95c3c45696d9f
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 18308 bytes
SHA-256: acc04404ef280e122f558782bcaa94cfaf507b188d5d7bf3b4c7c0ddac350e10
font_02_sfnt_off00013e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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