Malicious PDF — malware analysis report

Static analysis result for SHA-256 928433a461374d32…

MALICIOUS

PDF

96.3 KB Created: 2021-08-05 15:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c63792c13ea6f46137f7d2c635252eb7 SHA-1: fc14939e24da9367231acee3f2b469119f035b46 SHA-256: 928433a461374d3233780cbd32b97d2a3ad60a0abffcafc44c341c5b189bf15a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sned2ne7kej21sriq6kagd5d6d/takaxuvuxepilejupama.pdf In PDF document text
    • https://nguyenhungstone.com/uploads/image/files/44102184031.pdfIn PDF document text
    • https://schmitz.cz/res/file/67872085709.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/53927246308.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e871ffa76c3---22652573266.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fcdvh53cnf2s5fdvujb52qjt76/vositi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/72a19dd34619fbd1439e85910c935e4f/fabizadatabemuwixo.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/momikojozob.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/sabavamasuvidotepanol.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/87682669839.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc15d5d56a---26219213104.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a0f20fd7541e2daa045d6a4e15faebc/40736720629.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/98b9ace0f30aa9096887cff2a26b2d66/fojet.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/juxibewukedepibeg.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607381f2cd968---jomipaxapemoxupuniwowaxeb.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/fekuligukunituvesepazefob.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/60366707167.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/02d462881231d1790d449c738d82d100/sugoxemoxererobu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/k65nu6qsu2o1k5819j30g4qn9i/37419447160.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/11405048827.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5b13e2479b8e5361846af1ae685996f3/57224926500.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/wodijojufokez.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/mezofilasonev.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607843006e09d---naxokuxisazobu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/202018095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+x+plane+11+for+free+on+ipadPDF 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_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 18680 bytes
SHA-256: 367164eddfd095ef3da346e7a4351edab6d268a8a4de568ca957bc353552f24c
font_01_sfnt_off00014117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14117 10736 bytes
SHA-256: 7915be427535f2d56d0c350c91b2564c130d31a492bcb408213af99ee5c39b01
font_02_sfnt_off000159c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1