Malicious PDF — malware analysis report

Static analysis result for SHA-256 db362ae017d88a3f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 07:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edc3fad1a48b61f68586064c816349d6 SHA-1: d6ad5a1b51488934bee487640ac6414e9672d742 SHA-256: db362ae017d88a3f4dcdb3d21165eaee9cc890b878fb2129ebd8c2e4b06918de
184 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and external links. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech support scams. The embedded JavaScript and numerous external links likely serve to download further malicious content or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://irlanc.ru/uplcv?utm_term=android+phone+hacker+activation+code PDF link annotation
    • http://kuresi-kaitori.com/upload/content_pic/files/naseviwigi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131192727eda---23403095594.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///femelazaw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/9737219577.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/juzevavetexap.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/71288381529.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/pexelo.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/21093416609.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0346b8d40---zuxamoresapunesi.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/viwoboxavodipafajegu.pdfIn PDF document text
    • https://arerp.kr/data/file///sidinuxuka.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/41610172224.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/66980790708.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/xojadokiravenaxokatewelu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/64ed975b90119eaa76b59deb6baad63a/68282787460.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/likesoperewa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1d044863---87637097999.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/95740242938.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/vozosumatovitufi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/07e75e17c10e2148a4693f9f761eb384/85082391660.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/logetitabogugik.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/pusiforejepiramit.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/pigemof.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/womumigifufivowideti.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/vefotase.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_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 17048 bytes
SHA-256: d24f0c989df398f704a4c10c2c40d1005968e66e91d1a496fde44d3c43f5d995
font_01_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 10536 bytes
SHA-256: 4f90f98e7b00f34a6124e6b834f40d364f435d05b1ccfc7ad33e90ec567d94af
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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