Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93b3e9180a38382…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 14:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db3e56c13142f934f3b734b30492a3b6 SHA-1: d295b5e41f8e50d4b1aae8e1f888e3a04ac1df5f SHA-256: e93b3e9180a38382758883e262c93fee0d9d7ec6310f5d5c6608a2772380a6a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=activity+launcher+miui PDF link annotation
    • https://samsungdvmklima.com/upload/ckfinder/files/34271213610.pdfIn PDF document text
    • http://capital96.com/userfiles/file/2949730057.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/gizetar.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/38515374946.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/weroj.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/7ndlh7ia1b5vkqn0sv9jdr07f8/92698308714.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/5128645575.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/59210603619.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/22072723945.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/rosefomametifizopib.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/josexomi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/60084251839.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8456e6d53174ec230cdcce910a22ef68/78134895537.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/68393886574.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/woranumesojaponejokupama.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dd537c32---tupam.pdfIn PDF document text
    • http://osayit.com/images/file/lolevefuduko.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/73485703392.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/69210780344.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8dacbc77---99149360654.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/14152567805.pdfIn PDF document text
    • http://npas.ru/pic/file/nolisowafunezigisa.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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10468 bytes
SHA-256: fa4e68eea1f9fa18f32f9ac8480f16fb3eb592b72ea5120af45cfff391adc5c3
font_02_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 19056 bytes
SHA-256: cd3bcfbf5a5dcd785a81ca0804f941dcd46b88b8dfc5dd4bf7b439f1b3bd10a6