Malicious PDF — malware analysis report

Static analysis result for SHA-256 19113dce68468a7d…

MALICIOUS

PDF

94.7 KB Created: 2021-07-04 21:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f695f0f425e2bf70d3c434ced3960d2 SHA-1: 7a09f1dc063b7ac018e6da1be536cb09e4e98f4e SHA-256: 19113dce68468a7d8162789e2be24c5c936691c89e53a6095c80d16207811b5d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=willow+and+jada+smith PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0d1a7bb95f967c3adb9d3c0e15333f47/maluxoxekebijatupof.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0e16f6ee85d3ea7600d47c511ff18130/julewijogezaje.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/sobebilawutekobevudodoma.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507053104.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/1086484672.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jiwazusi.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/94218764543.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c7cd910a859cd88c30863c9a11916579/21937927839.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f06d18754d0987ac3164d17ebf1e9fdf/fedigopifutefumini.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9322f2e1fd0e4da3277ef14ea649a6e3/zopatibi.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/ponezowepan.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/80a7491f464d7073cd31be4cb37733fe/xataximunivu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb8cc02af---14047422254.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/vobip.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/iasi8lkhu5v1dmro2gafk57ht7/54757217866.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/jabeziwisol.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xezilujudosusixizuf.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v04oti2lueoqohlmhppi9dfhko/71067963049.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/62fa4d833a74bdb5056b6acc0c3ca576/gawazekesaregixudegekor.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/04b12d794946be482545d0cacf7fa9b4/tekusanizipat.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ccc177cf8a186876a859cf72c4ad1ba5/97988390223.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/72353879408.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nkd2cv549mvjehcq88iofmm1g0/42903523323.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/28254451459.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be0b16cf958---37043162955.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_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 25892 bytes
SHA-256: 1b9d038226aa7f40285aeb6b699a45f968a7dbd780336578bfc23cfd85c23597
font_01_sfnt_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 10488 bytes
SHA-256: 9155b6098a84475b06eaffffd859f3dc0daf759f15af4109e3717adf8c931efa
font_02_sfnt_off000155c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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