Malicious PDF — malware analysis report

Static analysis result for SHA-256 556cbc4795f18093…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 09:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1d9e59cb9b100380e2b43830db75ed61 SHA-1: d6a98979b3780271373276d27d84ad9689b9b1ef SHA-256: 556cbc4795f1809302581a8e8cfe60013bb0c5c7205ed044f9245aab8d92ecd2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f726e5bb12---sesagidiraf.pdf In PDF document text
    • http://boonfagrandhome.com/user_img/files/xejubemipogevobo.pdfIn PDF document text
    • https://12shio2.com/contents/files/64225987595.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/4456570380.pdfIn PDF document text
    • http://chinalabware.net/d/files/70100472591.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/jizerudosidudokuwamegujif.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_390534BE1CDB0449.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/mujedaroloxunivu.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/79928669603.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/ponupuvis.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161350d3e2f644---sofetaror.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffb1acd49---2044418145.pdfPDF link annotation
    • http://tnslib.net/userfiles/files/zujepikapilop.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cabaeae6---62109099250.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/nepefevalakaxul.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210901112429.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/galufirofelawiw.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/61420970202.pdfIn PDF document text
    • https://dacola.com/upload/files/10396479036.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/76910679917.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/23593681077.pdfIn PDF document text
    • http://findacommodity.com/upload/file/88240680776.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/32948795343.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/50698254297.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/87551166958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shut+talkback+offPDF link annotation
    • 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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 19120 bytes
SHA-256: 754bad5316c095119e2a07cf0b27205d2fb0ca6e1c1378d60023defba8d70f16
font_01_sfnt_off00010b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4B 10244 bytes
SHA-256: 8053a5a99ca41c5892e1722ad61e0241592a179f790256ff923f84a28bc097ea
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1