Malicious PDF — malware analysis report

Static analysis result for SHA-256 f059364bd89bb4ab…

MALICIOUS

PDF

87.5 KB Created: 2021-10-09 16:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 90c0d675b50cfd74964c457e65198000 SHA-1: 924a101dd5fc73b8b1042164057ea81c974b85af SHA-256: f059364bd89bb4ab8fbe777090485b60d1531ad0243000a65f6299251301fc44
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised websites or link farms, indicating a phishing or credential harvesting attempt. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to trick users into entering one-time codes or approving MFA prompts, likely to steal session tokens. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic to bypass gateway scanning by encrypting payloads, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://bestofbeer.ru/ckfinder/userfiles/files/nunafe.pdf In PDF document text
    • https://dmshospital.com/mm_engg/files/bibos.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/39280649833.pdfIn PDF document text
    • https://hyper.oneewe.com/_img/files/wumakoxekebenujarome.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/vuzarutik.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614246d8b2e5a---52510512720.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/bebitu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/gerominemawubonup.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/momexidob.pdfIn PDF document text
    • http://selidbe-beograd.info/files/65233595703.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/8322954820.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/gopefofolosedud.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/labexalafutegatixozatup.pdfIn PDF document text
    • http://nineslash.com/user_file/file/3119906572.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/15467521235.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615059a17c255---lidazelojasujuwojedexe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/add87825eadb50464df20b903d3b79a7/vugejanolisadobutib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b56c5e820d---gavinanuzuvubidexu.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/bobovunadazof.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/jikituzufinoviseb.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/4399116880.pdfIn PDF document text
    • http://videlec.be/ressource/file/44207766949.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/kivazetawusox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unlock+my+phone+pattern+if+i+forgotPDF 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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 19780 bytes
SHA-256: eecb9f4953a17927bd570a8c42892086963527de51cc846e54dee7f2b73a375c
font_02_sfnt_off00013677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13677 11140 bytes
SHA-256: 109cd2ce39c689fd4f242fe85116a91fb9e9a46bddaf76af082de6510d13932b

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