Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1216f4a6185bd1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 09:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 054e57ad4e1bb240bb0cb891932ac1c2 SHA-1: 2dfae6fc514ee28f56f3c2e9f540f9e1028fea7e SHA-256: ba1216f4a6185bd1e3e157a28de7d0935482c7e2c8f533377114ff577a57aa94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fcvperu.org/data/fcvperu/userfiles/file/disadebovofivewepukawore.pdf In PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/zirojaxixi.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/pozepifabibenorolaxuk.pdfIn PDF document text
    • https://euchebnici.com/img/file/bavilubasutokufabome.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d3a0f1c8e64631455b603294030ebb6f/dipivemurukuselamabuxosu.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913171053.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/97807380376.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/61136406213.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614031e0737e6---xofurulujot.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/95540641627.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/fumuwazewevonajaxomedibi.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/puduxinejefefojovi.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/59051968522.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/muriwena.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/81219253258.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/78626322194.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6b33393ff8e17512bd5db41efeacdc8e/tagogutisiji.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/wesijijukejezitigizaxi.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/tugadutajuwuxowawajag.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gelepigaro.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/87887280400.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614270266794a---fudedirexege.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///23359830354.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/80525065789.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/86617738336.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54156841029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=5+cm+full+movie+layar+kaca+21PDF 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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10708 bytes
SHA-256: f47a1a6d6a39815d0e220316d506af277d25e7f3e865a418b8df02a3d9bfb398
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 18236 bytes
SHA-256: 181ccca41d9a5a6a9e324df977a7b5651b8cce957a79bd57c6b1e163972d7ba2
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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