Malicious PDF — malware analysis report

Static analysis result for SHA-256 8286f072d102d25e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 18:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b145e59dbdc7e145c9cf07c321792a1c SHA-1: f4f957a6716dfd7b97c53907677f00b7547fe514 SHA-256: 8286f072d102d25e8b2df6897b1fa2a84b1c16d28ac63d66d2d29e3407499caf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/161f05616dc71bde0ce5dc2c90191691/rovipekukisowuzuvugudu.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1665a9fe3635fc862542907612fa5c98/8619965395.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/kilaximaxutapubasonaj.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/97802405041.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1472654767.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/guxojutonogata.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/basugowenak.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/60179309801.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/kogisipulukonemopu.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/33278805964.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/toketuduwefajataka.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/68496331152.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/1752556798.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec02b66974---duravume.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/fuvodarilinewuduw.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/98113405747.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/fadumimip.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/63834298397.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/65842803056.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/rewulutasud.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a19bb2d7a---zuwuxojexatijolexo.pdfIn PDF document text
    • http://aven.su/userfiles/file/bomevizavitajed.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17705888586.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/wekadomabifopezekifudiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ppsspp+games+compressedPDF 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_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10516 bytes
SHA-256: f9d163fa4516a9424de47844f0fb94adbc04d7006c6dcbaad4dd08027334ed64
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 18144 bytes
SHA-256: e789039e1ae4e770d655c8e1610dd91ee67a0c2a26ffa91a1ad6c9627e4d42f1