Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cc07c7b52ce99c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 05:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f1dbc1c014e82c1481765f762538bd7 SHA-1: dbd40d46a7eab7c0ce744c7a9880c9a0b08f259b SHA-256: b8cc07c7b52ce99c7364bc3832178163ee33ecafebf0f1158c0213871f22c7cd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, forming a link farm. Heuristics indicate this is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=play+pc+games+on+android+for+free PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ac47ad41e---48485050210.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210905190155.pdfIn PDF document text
    • http://1careglobal.com/upload/files/pelelilasomofuwur.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/20472425708.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/sases.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/tirutogubewidune.pdfIn PDF document text
    • https://ksuskalology.com/images/file/40314103306.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/leveb.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/78611977714.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630872950.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/57938262784.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/54125634915.pdfIn PDF document text
    • http://www.pvvc.cz/files/26400360805.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/93496842791.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/lulomedirewekon.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486704a1a9d---bidajonukadugawigozedekob.pdfIn PDF document text
    • http://keacg.com/upload/files/roderagetamom.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/fikuxixidenusinisivuwegal.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/mupaxalefidenuzeko.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b2a7643bde02be7c4c30105039f3c9aa/vadukafodafutawale.pdfIn PDF document text
    • http://asid.rw/userfiles/file/larubuk.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/nanowenus.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/fojagepekudatunazoserofiw.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/2109060532097274897o7869wsfdyh.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/89374408714.pdfIn PDF document text
    • 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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 10980 bytes
SHA-256: b084b09f6e4b75c832d8b6c726a5f058f7fb4356652bfdb87a9fdbe30e46f617
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 17788 bytes
SHA-256: 2682ce77cc7edf4b605984f0f3b412b27b09cecc5ea133e13501283ef6aa4046
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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