Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13d2c3db2d18c63…

MALICIOUS

PDF

97.0 KB Created: 2021-09-17 02:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f039bde432b29965c961c4b2cb7b319 SHA-1: c8b70c71ffa9e7f7672a1d4689a08e8c2bbe9e77 SHA-256: c13d2c3db2d18c63d5c3bda264160ef7df0b75879ab2a0523427da9d048adc34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it attempts to execute code within the PDF viewer. Furthermore, it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4ljjcd8bqjh16ded5rr32sla29/muwalikiginasiv.pdf In PDF document text
    • http://kavtas.com/images_upload/files/wizasadolopupokisuk.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/19431363073.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagije.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/govudelosuxinugojukuwuxi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a6d604afe---botajumadibon.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/56437630371.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/82655788425.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/14901332668.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161383ffab6e18---18467527952.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/62629596599.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/72257250713.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424073ef2dc---93521473829.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/wazezulunowopas.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/da78bef2a36c870f53bef9ab104447f0/73087857421.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210913074718881615.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cd9c99543d11528df72c8645e9a6ab33/12603915278.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/grf1pg99l6uiq7nr3s3odse7tl/wofamu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/nesitimurutupuvetumikikod.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/3537118161.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kipipagewe.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/xufevedimoroz.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/83559401078.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/modosavilexinerabuzoka.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/bewivexofix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=melhores+jogos+de+estrategia+para+androidPDF 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_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 20200 bytes
SHA-256: af451641ed5a83c82eb508fa6a2ee6fbbb702679e4c5b2cb4ab9d0e80b266d38
font_01_sfnt_off00014521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D38 10792 bytes
SHA-256: 041ef156d3d0940e3019bc0391a67c2cf2685ce8e4a551385e0489494ac9920d

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