Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a32c3bcdaf47de…

MALICIOUS

PDF

114.5 KB Created: 2021-09-04 00:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b81b825199615467535ed571b4faf525 SHA-1: 6cc684f55a9f3f282a705fa9f7a96491c99a8868 SHA-256: b8a32c3bcdaf47de9df471f1d14660d92736ab0364abfda105585a4571e62fb3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=mdx+with+ssas+2012+cookbook+pdf+free+download PDF link annotation
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/e5cinvpcn120af95dtuo3ookiq/vefedepo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3e442035---zojilotonajanosulokugolo.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1627269595.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021081210423678.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/96254880921.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/57286ca246f00592734d2ceb6e9034f2/15525545706.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///29331606420.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/rikagog.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/rimesovodawawofemamup.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e45815f8---tesujulo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/76382406886.pdfIn PDF document text
    • http://museeducuir.org/upload/files/bubameza.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5642q429hom487kbmmuel1gfm8/nikidisemaxetugowabedi.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/bujodubaroliximamoxamegef.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b023865b9e---52454078702.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/791215d71ba964fc2bbd37a8b409c53a/dikawinanumaradoja.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/70850986762.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/sevofikururirogezumo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847a6611f9---76450894242.pdfPDF link annotation
    • https://baoholaodong24.com/userfiles/file/95807404644.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e0c84c2e640a391b55740f3b00414bde/zujuvoginakupul.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/17fbd36daeaf52fe29a2b3c23e8b4540/28453361616.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/33284469765.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14183535464.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_off00015767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15767 11424 bytes
SHA-256: 44388cf46b01cc97bd0f8f3d5ac9cde9e42283e06f543eed7ea511e259cdfdb4
font_01_sfnt_off00017244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A56 19036 bytes
SHA-256: 2b8495ecb98a882dff31ae10ff61fc70a754d74e0bd86cfd8008897f01eea648