Malicious PDF — malware analysis report

Static analysis result for SHA-256 f359d1457c4069b6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 06:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 338de7f2e5a5678d7f0c62b59c1caf5f SHA-1: 3927c002e981e0e7bc968e5889a2d76599a7d1ee SHA-256: f359d1457c4069b67ef91dcb9fe2e21ecebf821499cb9dd8b40a4fcd4cd848f0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to manipulate search results or redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://shioturboapi4-xyz.com/contents/files/31093947191.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jjs6nqa834g2sshidamr09oo76/13800940712.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1ef37b91---pabutexuvesukimitidopixux.pdfIn PDF document text
    • http://groupkaishan.com/d/files/72404612345.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/86406816332.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/tulotarimebipunegadov.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/xavabinogilisofatulo.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/dibativogurik.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/24333945817.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/dizewapiwonevixobi.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vivepivavolizinawul.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/83288458702.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/fogonotarapaxujegiduku.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/28463193638.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/komagumebiwirogesexu.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/gitowute.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/64080478167.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430412b1f88---27171573673.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/muregijonujopa.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/wisugatakedebub.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/14420993412.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/34479347295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=need+for+speed+the+run+android+apkPDF 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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 10716 bytes
SHA-256: 4ea974235a1e738ec858d5599965d5754ca4855cbadd1e26adbefa0c40ed0c9f
font_01_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16532 bytes
SHA-256: f6ed8315b0092e91a166ae6e0cef62fbdd1e1f477d0e045c50656f8590be1b22
font_02_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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