Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8ee73a4c5098a8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-28 03:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30f88d4bd905e1b0ecdc1511444df703 SHA-1: bf029924c994a0d0be153b476963ecc7815c9a9b SHA-256: cc8ee73a4c5098a88345477ffff9538fc401134c6cc378d7c5558cf9ff384415
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure itself is not directly executable but serves as a deceptive intermediary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://abpjseah.news-read.com/upload/files/vibulenutovubaneti.pdf In PDF document text
    • https://branchennachweis.eu/userfiles/file/83228099185.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dujisojemujotukejozuj.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/88609919475.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/malejimodowaxeleme.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc09d0128fed473c57cdc0989835bf2e/tutawotanawawujetesilamaf.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/24552920300.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/didab.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/8327245076.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/ketazuvowabopuburazifog.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131033db9ec5---jenesijaz.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/74696544981.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zumuvelawikadorakekevug.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/dejuwi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/numosivigerejojad.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/29952298542.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/24491421051.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/55061957397.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xatagosodanepijabulada.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/ralanerex.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/mofoxezetamepesebakuke.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161524c47974c3---61546574019.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/26243845136.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/35916623544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=heroes+of+might+and+magic+3+ios+2019PDF 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
stream_002_off0000be96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBE96 11504 bytes
SHA-256: 66ee1607e7dc2ec7c6d8d770dc42b08b70aa9e83d07b3c7c4dd45be4bb71e9f6
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 19588 bytes
SHA-256: 518527592e47774f14b2423b050a4a43117d12d754537aea86085b37e89cbd85
font_02_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1