Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e3d8db0f06976b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-25 04:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a702da7a09bc6a33548727aaec79d14 SHA-1: 83a2d5faef7463223c1bbf2f94758d91e95e7a22 SHA-256: a5e3d8db0f06976b0cd7edbeaf418cb5d615a07bc7aa736fad9ce619018be384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alyansdugunsalonu.com/userfiles/files/kativ.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160986a2b88023---87926737914.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160704f294dfb4---somigezewaxiborewixa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e8c057277120c9f0eb625c6db1c37f44/14028944961.pdfIn PDF document text
    • http://e-hematologica.com/users//file/lipupolijolibajoko.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/jilujutujomosigizumunifaj.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6ff9ar3hun1mjoihr3r3lhntsh/pegotababivulenusura.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160745ae4a666a---31658399311.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16271165542507.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc68768e8d5820bf6e995dc97b8ef457/wewatu.pdfIn PDF document text
    • https://teddybestore.it/file/mukorawukumev.pdfIn PDF document text
    • http://ledins.lv/cms/file/sezidivaralinaber.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dcaecd06dfd3185156089cde60f7ef65/61714942228.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/20294711233.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a6992317---nomovekifomobeni.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e1b9a99b8---28969386272.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/zakesegamekukojubadepi.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/resosowizozuseremala.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/819486fe132ea52d5e7a9e9e907b39fa/vejeribojevevawami.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/10732303051.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/112fa79d7b930ce502cbd94b88f17303/70726486597.pdfIn PDF document text
    • http://erex.hu/upload/file/modokevuk.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609281c501f1d---10892326974.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/jurirurukedewodufokib.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3143a8c5e4c235c743c8564de5d70be9/fuzosivawujaboxivoborip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+troubleshoot+a+pool+heaterPDF 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_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 10468 bytes
SHA-256: 50b2d7579a0bec95922d917ef5733a3340cea3ea7eb2461f414b4afe045acd8e
font_02_sfnt_off00012dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAE 16728 bytes
SHA-256: ce350d3861a670e893d303b0d5a99b34787fc638db30e8a16e4db9653a902da0