Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d1c906f3ec23a3…

MALICIOUS

PDF

81.8 KB Created: 2021-08-09 08:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f47bba4198f730e75a9bf1bb623eb8c4 SHA-1: d6fccae559fe322fab066b5bc3ef49f941229c6f SHA-256: c6d1c906f3ec23a3ac16018bed901c426d14aa17168e25c9cac641e6ba58b22e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=arap%C3%A7a+11+s%C4%B1n%C4%B1f+ders+kitab%C4%B1+cevaplar%C4%B1+terc%C3%BCmesi+2019 PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f23053bc00be15b0c6d49eec36c4c95b/lapive.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/dolodexenir.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8984f5d0d1b416603b17cd5309709f7b/jumixonazeduvakikaf.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/21b9b45823b889b75fb8e1d914b8614d/15378089371.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/biwusa.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/pukimimulamabilovolesafo.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/dewusomaburujalixanojelit.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/bafufakaf.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/leruvikiduzalo.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/16395096823.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e4af2f55ada6b706014830cda5928f69/tumuvuguwamufavudon.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/66448687680.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6cc8c63f---14059158881.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e5de67df---vumofeditafip.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809a47328a5---59074258165.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90ff160f2---konejabujovuz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91227974ba---xepadukozedaji.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c1232f15606622f7d079a64a5e5495d7/31646813124.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/zojogo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea66041f0---bugasij.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/31838707413.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/95961940875.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/wevonirebofizevudimu.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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 18664 bytes
SHA-256: 0e22c8ed5a8d5d235c1af0427f3a70fb9f9606cdc2831bb1cce9f5d9288b78f7
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 11840 bytes
SHA-256: 1ecefed296e5f82ca2255027968bb6527ea3badc84b5c4bf62e5252e9eb184b7

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