Malicious PDF — malware analysis report

Static analysis result for SHA-256 4572e11001446c93…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 09:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11ca03b122c1d845f4bf917a5ae2addd SHA-1: 864d39f54f84eb262d354b3ea04779dff33d6e66 SHA-256: 4572e11001446c93b38fa888c5cd0889049c633edae469b8e84f348e145b5e4c
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://drafthe.ru/uplcv?utm_term=work+rules+laszlo+bock+pdf+free+download PDF link annotation
    • http://185.33.116.145/~acus01/upload/files/70136184656.pdfPDF link annotation
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/penamapusapowinugi.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210915213714.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/53168394209.pdfIn PDF document text
    • http://klenderbio.com/upload/files/veresebarob.pdfIn PDF document text
    • http://www.agot.pl/upload/file/34318396750.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/bururo.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/zapenawejamoxu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7a2a889df23c15705be15000f260c2f0/ronajufugepadijoxovifale.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/98487696052.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210902135510.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pepoko.pdfIn PDF document text
    • http://potya.com/32257952526.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/93556414678.pdfIn PDF document text
    • http://fruitsad.pl/images/file/kulojosolexefizolage.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/xuvepevabuwurewabuwo.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/98181701191.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/44002182460.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395f195d513---67307895470.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98a6d5cc8---pinoboluvuvivenawaf.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/55378991430.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/96496312569.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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 10892 bytes
SHA-256: 89c1ae4cb32885bdb4b0bd5797fdd09b71bbc8030a82a69729fcc1c95de1e665
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 18796 bytes
SHA-256: 8c6b357702f0a087a0f386f714a3856b77b61690364b1f5a1a3bb3f6da776af8

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