Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea7caf7da87e3ef…

MALICIOUS

PDF

97.4 KB Created: 2021-07-31 12:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a220929ad9094c3a56e05371586bad57 SHA-1: 4c8559932bb8e0083305a5e27c3b2f87e6904c6a SHA-256: 1ea7caf7da87e3ef376ecdf16a658d0d1a5cb1f678082ad2817ad0dfcbf3ac2a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS uploads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may contain instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://datev.hu/ckfinder/userfiles/files/42232353387.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21ae84d225---73117907222.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nenefasunojonojijeduvez.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16093ddbd4a361---jumemimutojupufepijuziti.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606fabd1249e5---42097730761.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7b8bet3g5gh1np35kg7t56tp98/42163223118.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/zapulagemufino.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xutovewakasikisusarif.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/kivawo.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zepuzinewalusogunitu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4fed65ca---pagegi.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/munilukurojigezedalijisuk.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e6723427---83921153681.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc21ad3e8---42725693644.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/81875db9583ad823cc298d9a3a47fd90/34048210530.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/jipabaked.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf6a37afbb7549f6aad94934370bc7ec/48772535897.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2df3306ab---91067654691.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8c0bb2a4c5055df4c6d7b795bc2bd95c/nesinadul.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/42531541719.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160741e996ea48---pulewafak.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7f082e54349a5f076d62a5388d02d574/zumali.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085013f6ef5e---22354059839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perks+of+being+a+wallflower+quotes+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 11124 bytes
SHA-256: f9b4e43ad9811e3197eefc64dc47684254d12dcc5fb274deab3c8491e2fac2fd
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_03_sfnt_off00014ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA0 16972 bytes
SHA-256: 528fa7a69141a289ef0a08241a88e1b66f910a98ecf7125523e3ec4f324b337f

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