Malicious PDF — malware analysis report

Static analysis result for SHA-256 8425b1e86fcffb56…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 05:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 688f5599a67279229af08a26cea097ce SHA-1: d07a97bc0c7172393fd5e9d344aba58d39a3947a SHA-256: 8425b1e86fcffb56b5f3313304b5dda2ad76c354c90fd73f5be3c9111e3af976
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=grade+four+math+worksheets+pdf PDF link annotation
    • https://ibextrail.com/editor-images/67725343825.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8228722de---tuzawafuzatabewimojigun.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/mawadevinu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/787ffc22acfefda30ea9fa8ae9c5d78b/towenudigufig.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/48392573964.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/57244642398.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/nirunigawufon.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/30773337543.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/faa4df14d6b5b9bad715ec04ebd87df2/6309371539.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a5f976c8fd8dda1d2107b84cad57bba2/89406791109.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612717289820f---77170856874.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/sosomewone.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5310b35bbc---wozefala.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/55069544686.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/15416985504.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/timurutagivufusurogel.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/farerowu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f144458565b748a4705a29d0cc2b19a/11371638512.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609debfe0cf99---93382917735.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b190e31ef---fusigisopafavarumoluda.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210810214518_1194144403.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/56037319249.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/930eb23c596d4e4644409e148cb813da/46205403911.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/tawugitexuvaviwomopixodab.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/67312399053.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/1p1l8qul1c3ckut8rrt4obldr4/78918345972.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/netaxejevowagazebiku.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 17076 bytes
SHA-256: f09839da0bed3eb127a922c513f9e679c00abda1259e68029964e692fe688f67
font_01_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 10836 bytes
SHA-256: defad495ac549177ac1cd498922e76651797f6c174e301dd003338fdf6c23e5d

Open this report in the interactive analyzer, or submit your own file for analysis.