Malicious PDF — malware analysis report

Static analysis result for SHA-256 573d3c51480a22df…

MALICIOUS

PDF

154.1 KB Created: 2021-07-02 03:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abbe1696b85443a5be6f023dc3985882 SHA-1: 93ede37098ed50f348249d5f9818fe13054ee9ad SHA-256: 573d3c51480a22df481d5b05c29ccceec240b46b062973cf997b945d46c47716
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document is classified as malicious and exhibits characteristics of a credential harvesting lure, specifically targeting MFA or one-time codes. The document leverages numerous URLs hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier strongly indicates maliciousness, and ClamAV detection confirms this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • 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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fda8c515---52820545681.pdf In PDF document text
    • http://surmounttravel.com/userfiles/files/25574130878.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090079a7fb03---69978724049.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/potuvudavumatub.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6542be0712cf5656c936e45798db5698/5269567374.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jijupoliki.pdfIn PDF document text
    • http://turatabor.hu/media/99472617892.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5660da3a7d144cd6b7b18e5d9385797e/47765657921.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/40494302019.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dt8rp93kd4dmakv65ifahltau5/delesukumew.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/312dbaf1719a807845150a5f675435df/90402797459.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/900b832ccab319f786b4bff8fb89d221/88077670887.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/19939132020.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/85859713815.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d8462c13d5ebb16de6b7b2dcf9abb0d7/jimuzajuwewazuw.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cd297b65de27c6cabb747af251548edf/padabomigebulo.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/94140807871.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/16088845009.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/zesilogefunem.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160792cd5b9819---zexijuraxunopomoso.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/89993021585.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789060f1b88---fikilupelezazova.pdfIn PDF document text
    • http://inistor.com/ufiles/files/gigolinefasebavurudigire.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/nitoxukedukiwowemepebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=metronidazole+for+pidPDF 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_off0001fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA2F 10376 bytes
SHA-256: 30823df1a92b22256ecc1f81505476c9b10ea227fd039582d9cd12fb50c1cabe
font_01_sfnt_off000211ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211BA 18484 bytes
SHA-256: 8503ce9e4c3f95b2981fc222ad6074b35172e2cb8fac945b5cefaebbf417dc21
font_02_sfnt_off000242d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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