Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec5661f6adda055…

MALICIOUS

PDF

90.7 KB Created: 2021-07-12 17:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84682d7063ae01d726b6ba6f337859cf SHA-1: f2593a58cc09693cac18689cc6c233239923da44 SHA-256: 8ec5661f6adda05561e42b173dfd606df5164ee5371635e015e76297f19f8ed8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098626f62536---bezowalojofevoja.pdf
    • https://noventa.cz/media/files/file/fetirewaleforovarowezizi.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/6fq324ru90qhoggbltmqcpnfhn/zobumadaponelixejavalose.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f9248bf57c1d4b2868a5d3cb1909f32c/46430361451.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b8c2942a3ee1af77396efc2ce230ca90/mufudisagirapuwotomajo.pdf
    • http://wksx.top/images/userfiles/file/birajitunodedilij.pdf
    • https://giorgiosantinelli.it/file/49734580316.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/40820419717.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/64fdafcd974a88ebc773d9f8b753dcfe/pikofuj.pdf
    • http://bogaarchitetti.it/userfiles/files/19143856340.pdf
    • http://leaguengn.com/userfiles/file///58690005472.pdf
    • http://riskhedgetech.com/uploaded/file/120555852460afe92f9bb43.pdf
    • http://bafiti.com/sklep/userfiles/file/tifozezabipiwumavop.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7d6bebe---917861212.pdf
    • https://takipcisec.com/calisma2/files/uploads/31143487788.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4m24i2g4fo5pc04p3jrmivk0l4/xuribofipiv.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/79352831101.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89372099852.pdf
    • http://cafemsoffice.com/userfiles/files/13677305786.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18745027816098a07d6048a.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/134923fe96d877528dd8d7b3cfeec9ca/30713541626.pdf
    • http://prvugkh.ru/uploads/files/27146846518.pdf
    • http://supermarketdv.ru/files/file/wudaweduwezenanabagapobok.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5efc3ca92b---dokezesajopimebu.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/903868acea0e642a4ffeda50169ce726/14799595433.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=middle+age+adulthood+development
    • 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_off00010254.bin
a7a5ba28fa2a62556c586612dc80a0d116727220d8e13bcfe6448b6a4cacf31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 10728 bytes
font_01_sfnt_off00011a89.bin
65218990d792f4b6522b36367af5f657cf233eb1c17e7a0dbfc73f235c85420e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16532 bytes
font_02_sfnt_off00014560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 16792 bytes