Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdae2bd37eef76c…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 21:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd413ee34cd27c90f60eaadfc0ed8015 SHA-1: b1c5029ddeb4270e4ef0da5bdc718ac0d7fa600e SHA-256: 1cdae2bd37eef76c2dbf80ad92b99a9d27bbbeadf6bed54ea8f647f109c5bb76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=dollars+to+costa+rican+colones PDF link annotation
    • https://apskarota.org/userfiles/file/wisurorakitajasifa.pdfIn PDF document text
    • http://esistore.be/userfiles/file/lisafoluxawa.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a509ad1716ec11f64912be42a3e2d81d/fipobemanuwawirabolenalos.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadca54e70---tobinage.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f125fac8ea---86591729092.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/judomanomig.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zokapatotasodanu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6ff880ed542d7378bf91d8dc3b6631a7/2543160165.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabec1cdfc---23352265480.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/78385239898.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/35579235683.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3e8b2bade51f074b3bdb2ce4dc8eb5d4/tunanidalasijavide.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/284a9be49e9caa632c6e25de6dfa6a8c/77242172052.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c972d95635---46108756243.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7eccd57e02e0f476fa679c73b40752f0/8043044022.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/oanprbhc3aqlrg40738ohrsej2/86297141235.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/pidumidujotefevenatu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ec4baf2f7---xawojiv.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e5d055b40478c036bb05de67ce9b6306/vabenutasu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf41444529e---bazoteropenetuwatejedi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/d0oui2bgs25jq1ohmilo2g6tto/54642198792.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a0b700b2---kuxak.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/11ad423675aea09ed2f0ba742922d6f5/gudoguf.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eea5cb5a6---25189520599.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 10224 bytes
SHA-256: 8b9ba43e67a30986952d3be078fb1d36f6242bdaccf36ce559679bbfdf9fd127
font_01_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 17764 bytes
SHA-256: 9b8e502ddbd1573953dc0d60e4ae7a48a094a53eebd841661c824391cec5dd06
font_03_sfnt_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 16224 bytes
SHA-256: 5dc452f2b4f8f6cf50bab96a09d9f243b03113461a4839846761b06a93380fa3

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