Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e8f6bdf10f15d3…

MALICIOUS

PDF

90.6 KB Created: 2021-06-30 02:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec90015e4a6a6936c0c4a1c9727db715 SHA-1: 3f486f21cbfde7785d3370e21be3f0fb77ecbc19 SHA-256: 47e8f6bdf10f15d385d839bdbb8b40fae7497c6426a1428bcca0322efb1e24dd
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting domains. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tokstar.com/_UploadFile/Images/file/kotusevozibepe.pdf
    • http://martonelektro.hu/files/file/32742639279.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077413c28c07---tovusutabaginaterewus.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f6ad7a2e---zopezonomunokuwavipawe.pdf
    • https://sunnyvale.com/wysiwygfiles/file/3950542553.pdf
    • http://benthanhsgfarm.net/images/uploads/files/60756353834.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/71402514c90a553cdf33c0cf331486eb/78062898150.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849dc021f60---37797341117.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7eb9dedae---93362033592.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/84f75280e398fcb985e119bd71b77e1f/wowuzifimevujewu.pdf
    • https://atlastoursntravels.com/userfiles/file/67045208357.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c715d2698---89915470091.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160745e7241e65---19331686761.pdf
    • http://writtenmail.com/upload_images/file/32192998012.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a200e897dfb---nutexanuvutumog.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/203351429b7c08668b45278755dd8343/fuvevun.pdf
    • http://struttur-arch.it/userfiles/files/59436360277.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1925665c60cdada8c49e4c42443a7639/81582043650.pdf
    • https://holocaustresearch.pl/nowy/photo/file/58668512780.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/42c18f0d700d56c3ef445ad75e7c6d3d/vasabonok.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d5f1e06d2efb5a16e90f7f4666f67893/82250735866.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/dd307cd2046698abf5b5f8c1acf21cce/walidapimavalagovuga.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2f2f64bbf0e0eee23bf7c2bc0e3b351f/gararolopavuli.pdf
    • https://sbsoftware.ro/admin/userfiles/file/wukowukumilap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=history+questions+and+answers+quiz
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe89.bin
92288a7644b43e4a35b60f13c5fc4eeb27954b9b692474ef256af899e3f8c105
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 10692 bytes
font_01_sfnt_off0001171c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 16792 bytes
font_02_sfnt_off00012f2e.bin
6950bdeb3bf9b37bff9a78dadaf7003cfdd6b2b12124236520b688611e0c36e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 17448 bytes