Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdec247d10d8db3b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 18:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24f39cb2b7d05fd47059f1156496a5d9 SHA-1: 471cf84c5a564eb99e80725c58c9ed09552c7ba5 SHA-256: fdec247d10d8db3b451787d4e136381091e3cc8caa63e7e0633a6bb8741cc87a
184 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and a high number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to host malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts users to call a phone number, a common tactic in tech-support scams or callback phishing schemes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://cructi.ru/uplcv?utm_term=brochill+app+install+in+play+store PDF link annotation
    • http://stl-hk.net/userfiles/23409242316.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161338247e8710---rukokodunenevobupato.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/uql1iv9bkli6e9jc4023noa376/90105986696.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/famifukabirapodosapijaja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a086e55cf8---26556500114.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138a4513e3a5---rabelim.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wagegasuridudojepulubu.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/40069500787.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/14819538852.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/1360943111.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7aacc30b---razizutib.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133031b0641a---85297642468.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xoboxopexesuwalojageliz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613895ae657d6---sireg.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139850cc3089---52600725951.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/rujosetodevozineworu.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631178394tJsB.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/gozilerasukagaj.pdfIn PDF document text
    • https://termoformat.md/img/files/tuxogujivuja.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vosoguzenopowukarerexu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133325fa3e81---4054552734.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/86087858973.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/75425663871.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/tuxuzovugusiwitifexefikax.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/fuvebagojuworiniwipika.pdfIn PDF document text
    • 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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 10640 bytes
SHA-256: a84aec52e904d071ca51c38caa6ee01c5961f0f24462c377c831eafe3dfba92a
font_02_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 17504 bytes
SHA-256: e22e6b5b17d3969ab149e751fafe30eecd6dacb554226c8ce3e3439c0929eeee

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