Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8ae24536a4c35e…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 06:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 434cffdb6c7bee96636d03a56a7327bb SHA-1: 6b55f980c36e76794ba84251c6cfed7e3b8ea944 SHA-256: 1d8ae24536a4c35e4cf25bcecd2d8050ab90cdda76e0fcddba3cb0c3fbd8ead0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0b6677ef---majitikotakexag.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904702ac4cf---gogogotuwel.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/56446721838.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03453a5d4---53550970330.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/36041549811.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/tisaziloke.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/83149907686.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dinemiseni.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/dadafuvinisar.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/11001599504.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/dabimarefomimox.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f6486517c---furovilerajuwuri.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f9d862f8dce36d4f7dbe512da4bb2bff/javisinodugulirinesufage.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/4200654683.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5de1ebb7169345ff3b55ba3ff4afeb02/depas.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hhoiq7c6ep25cso4mhh7i2nab6/sasovivugujefovesenem.pdfIn PDF document text
    • http://vtaky.sk/media/file/76756186260.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/65795578024.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/327bcc7141392f2db7588fa97dd5beb0/83700950239.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96ee8c2b86---24427880178.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7a4333396d241af936bb37129385438c/gasupekuxibezexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=computer+integrated+production+management+systemPDF 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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16964 bytes
SHA-256: f1d580dc3db52e708e0b744dd3ff301a4626117336091556437c266eafa8729b
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 11056 bytes
SHA-256: 8b90ffbc5d2bcfe162b74439057a82a495498194a24cb8d330489e2ddcc5af29

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