Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a284bc4402f5cb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 18:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb87a4f54efed10d4fabe31adea4a8e9 SHA-1: 07a65e4aba2f04b00172b50669334502e9f6775c SHA-256: 22a284bc4402f5cbe7ea5daa1d66ccee86311e0f8fc12f9a01ff1abad2ac8f93
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick the user into installing a browser update or extension. This suggests the primary goal is to facilitate further compromise, likely through credential theft or malware delivery via the embedded script and linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/49999524830.pdf In PDF document text
    • http://computergramm.com/userfiles/file/fejipo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/13202628785.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1e510df6cc68a63ae63b141131af875a/mibujinaveweruxuse.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5h93gvn8ibdq2mui8vvr2vsal9/defuzulupefimerobidotar.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/78279622607.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/sazoxedesape.pdfIn PDF document text
    • http://skisun.it/userfiles/files/wamukowiwakijitofoju.pdfIn PDF document text
    • http://fruitsad.pl/images/file/68100915283.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/jolufiwazavaxerepagogup.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/54606246278.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/72099425738.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/67451925049.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/53563034473.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/28328535784.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lizibizijalepikaderumiru.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/35063636547.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/mamuz.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/61305908667.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135d72ef1476---86112428299.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/29802877511.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/zulixaximirefip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diskdigger+video+recovery+pro+apk+downloadPDF 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_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 18436 bytes
SHA-256: fe5a13b76261e7563981f8192c7d8a5e5577c0377c0c80a091bcb89e7949a8b0
font_02_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 10948 bytes
SHA-256: 439ee06aa6c07ca73db4686576296e1d12b947587441afb153894ca8ce944666

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