Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ff32c38864510f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 15:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f260e26e8989a207b87f780458ff182c SHA-1: 6d0c1c240c16e4dd55452b31c582a159156fc0f0 SHA-256: 19ff32c38864510facf6b2d44f81513d1f9b248f95e87594486b6848a6800557
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing or spam campaign, primarily through its extensive use of external links. Many of these links point to compromised CMS uploads or disposable hosting, indicating an attempt to redirect users to malicious content. The presence of embedded JavaScript further suggests potential for malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

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 https://laborke.ru/uplcv?utm_term=basic+journal+entries+accounting+pdf PDF link annotation
    • https://whatproperty.ng/ckfinder/userfiles/files/foramupadal.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/dopebefimulopiwaginen.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c937d6add1---57720977225.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/pekexuletu.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082822f4f9fb---20929783065.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/wivekezoxumurobutagolu.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/bixejeve.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/71430644790.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/5307938234.pdfIn PDF document text
    • http://bamila.vn/luutru/files/pididedunasamemetenajeza.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210803053520_jw0wpv.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9cba1ca59e08ae97f43f9ba4f5a3d609/gefejinegixujigusi.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/lomuxidiru.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2ff39f62---toxurisojotuvinisezu.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210611122007.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/306779588.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/semoxineguxizajinosisob.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/mazas.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161165c8f8e20e---ditukib.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/tuxajanenapowozar.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ac566b18---taxigorijinoze.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088902cae927---julemupeboju.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/96128839402.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_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 18132 bytes
SHA-256: fefc0f2970a5fc22a7ecce64e3f80e0cf6bf9288466efdc6eb7d943222ca52a8
font_01_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12892 11076 bytes
SHA-256: 78113b7177f3988f6c88429fa846e6dc483e078cc2cc8b0fd3ccfff4051977bc

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