Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce5e1db86e86396…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 03:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52faf62ce54de77c2e91cd136ec348c8 SHA-1: edf0b550e8e5ceda9f940de254a14e922c2ce7b5 SHA-256: 8ce5e1db86e863963961c6dcd7169ed83fe894b2c81c9ecfd8b021b269dff14d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and linked content are indicative of a lure to download further malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=android+app+block+unknown+numbers PDF link annotation
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/33827200435.pdfPDF link annotation
    • http://gpsputhuppally.com/userfiles/file/jebenuboxanaxuxozi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/350086c1c85a8d6d6ef557af4dd9b349/81695259204.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kavexivu.pdfIn PDF document text
    • https://visualarchive.bg/files/80697410795.pdfIn PDF document text
    • https://ratoempat.com/contents/files/towakegafelibajurat.pdfIn PDF document text
    • http://tochalco.com/uploads/files/siravale.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/75903560867.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/xinugeninolojiv.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/91051353103.pdfIn PDF document text
    • http://ciskmv.com/css/file/katipidogosaxegibaka.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/47393159100.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1e3a74f4e7f0678d5711ca48a21f01c2/xitabalakafezekagokimadil.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_4D40A8D8EED37DDE.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ad3807b86489434404ef80777516c73b/zabuza.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27525464371.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/tufuru.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/69051068536.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/sabejonebobimogubu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/99011208701.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/94379620157.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/jodudojetipifakep.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/36939934895.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vovewekobedelizedujunoz.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/widawexuxirumafe.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/durokumogavatosixi.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_off0000c4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FA 17568 bytes
SHA-256: 857c78b309167bfbec0d811c36544996339ad23dfe39b8afb5f7ae945a34dbbb
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 10976 bytes
SHA-256: e4f1f44c792c6142e4a36689319e9f70ee50e173c2836f34191145b8aced0011

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