Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9ea25661484cfe…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 05:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d1f557f2953dd87e3aaeaec96f10a4f9 SHA-1: 0541ab4f888cd518957129ff716d45384813ad7e SHA-256: de9ea25661484cfe6c4e0bb1e481f7bb3a9fbcc0e07c155a208d1f774224b16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://hflbdq.com/uploads/file/041332068084.pdf In PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/wejulidepowibotenut.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092b226bdbd1---24564892859.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///totukilodoguzirasak.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/86895319466.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/esr19g32sq8lu4jfpkmgubli15/vutelidizibubidabexora.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af88566936---66793835955.pdfIn PDF document text
    • http://sakem.org/userfiles/files/27572956529.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/49875611718.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/11972800572.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/73338277066.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/50164467383.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5d77b0a840b604b35443204998a7462f/22877487971.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced5988dfe2---56886642853.pdfIn PDF document text
    • http://sung1.com/upload/files/82422479185.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/40094188023.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/wolitazifaduzowijo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/88789694084.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bc89b9138f1a17a82ee8361528885ba0/nomavugokejetefitutiv.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/gelugekitubaxogimod.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/witegemovadi.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/11309912564.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/gomibirojuvilekinoziv.pdfIn PDF document text
    • http://fedime.org/imagenes/witowijiditam.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/morigoriba.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5etbjiosncrjd9tfp5amb1rrql/32293709993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=banking+service+chronicle+pdf+october+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 11752 bytes
SHA-256: 56d901b959f7b05b8cbd702e99b8bac0f4797bb13b8db551fd8a0aafda029dbe
font_01_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 18144 bytes
SHA-256: 76d7edaae9dbfbb27e45e24a4072a5040e642d16603f8ebcfa6dee0a67002e53
font_03_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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