Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a682d22029cc86…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 19:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf27460586bdd11d3b5a846f82cbc62b SHA-1: 312df3ca4305a819b792fd0d5b9458b4f35139a4 SHA-256: f9a682d22029cc86d82161d2a2794e5f7750fe336f73cf58b6120e33da205223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to PDFs hosted on various websites, suggesting a link farm. Some of these links are hosted on domains that appear to be compromised CMS uploads, indicating a potential distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ylwlgwadmin.ylwl.cn/upload/files/banatodobajimejilip.pdf In PDF document text
    • http://euromarkcreations.com/new/fck_img/file/sametipo.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/lotaxajarinebako.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/14425871233.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f48ae888497d4aab04cd98e925ff4a09/powixuvamevepovil.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/81970123094.pdfIn PDF document text
    • https://anandalaya.in/resources/file/42958180623.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/kipubapeboxezumipulob.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/rumapun.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12256216607.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/vumama.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/12645996312.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/badexed.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/olnq13820pn64vf206rd1l1u64/89834699030.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/80638091029.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/03e56674907ebcca5456f38929905a6b/zofalesobo.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/17150906741.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0b8c5d3a760d1765df2abc0a651b223d/56141731944.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/56224567687.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613037f4bb6c5---bulivoxusaribipojep.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382ebdab2db---vibebovabo.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/wemerijeweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=embedded+system+development+pdfPDF 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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 18064 bytes
SHA-256: 50ef214d937d2fa0e57873c46fdc5becb77e616794604afe9f3515e7f978ca56
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 10608 bytes
SHA-256: 931e85f2c3c0b0cdbbb1bf715958d56532ab06eb5567676ab51f8d7d0f51955d
font_02_sfnt_off000126d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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