Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b50895a29a9ca00…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 02:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 569b2ff910db6a912656f273f00d5b59 SHA-1: a7aa6f9d6cbaacfc3ad4c6c10659c97397a4305a SHA-256: 2b50895a29a9ca00890ef19794f626b56fd2a8a25c12c3fb3423d5d1562ae4f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs forming a link farm, many hosted on compromised WordPress sites. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also returned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=pokemon+rom+hack+emulator PDF link annotation
    • https://securitydm.net/slicice/file/wamedidevi.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/debosodikesu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413cc8b0827---74945008335.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bujegizalijokeginedijof.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8f167358942b0f4d6e0ed54102e374ea/lenudegudugiwikuvofexe.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/duxusi.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/792116298.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/733304414.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/72d90628bac2d0d857aa00055982d2c4/luxazo.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/89667560218.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/paxavapakinov.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/muvimofomad.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pilojinaseragotujo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/74c12beb275fac5df5af76af9291a444/11402275688.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe29cb064c---716026471.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/nanolovut.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/34330000391.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/1029664579.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631323673_28ee665cc6.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/73592782929.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/89073395476.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/22495735811.pdfIn PDF document text
    • http://sql110.com/pic/norazovaxavuxin.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xoposodakemusapemerulux.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/dixisibuvibotizonugo.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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 10428 bytes
SHA-256: 0ed1be7afc1850af28cde3d7bd8e1e1b8f2f6bfbca59bb68b0ee125862988c6a
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 19336 bytes
SHA-256: a623b723c9b6ee4d2e0cc564d59bfcaea44df64f8f23f4ff65b63b32ddb38c0c