Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eaf9af955bae00…

MALICIOUS

PDF

86.6 KB Created: 2021-07-25 17:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: de6f3e95f5df7e512155d67c112b97c7 SHA-1: 69cc4c5da6ae5dacdca7e265c5bfec84a8e81c3c SHA-256: c8eaf9af955bae0033afb0ade17683b06ac430e4bedc2e2b28969834f1138a2b
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, and includes a visual download button lure. These elements suggest the document is designed to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anmoul.com/userfiles/file/20820266724.pdf In PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/64348698129.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/tegugomif.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be431c7d365---sulazamipona.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/69361421151.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0fb16391---jatuzavi.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/3738813393.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/52720500622.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/33009018354.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/98680487454.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/45131000532.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/45754859362.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/kezuvoni.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/33839569670.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/77mnsr17aqejs1sjj69kpmu86m/nevofususotajipa.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/28557072151.pdfIn PDF document text
    • http://kaies.net/upfiles/file/82765534755.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c578063ff---lafonubasinaberaberizuvi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4ff115ce8bc188abe23dd073296bd8cb/72978775067.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/58564600722.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb62899adc---89319863599.pdfIn PDF document text
    • https:///www.minecraft.net/helpLEARNIn PDF document text
    • https:///www.minecraft.net/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+bedrock+free+download+pc+1.16.201PDF 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_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16988 bytes
SHA-256: 6e28c5110f1a87268bfa2ee027db28e2814d234c836ca0ba3d738a6db9f5af0c
font_01_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 11284 bytes
SHA-256: 382ef0ee11dc60e1a2ced6aa7897e10704eb4c4df28584aac3e1f2bb491df20d

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