Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6bb554961a62eb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-26 03:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 826824a0c610d2af82b7438ab5a2e264 SHA-1: c1d1e9c0c3c491e1de4d61d846247ed5eb31677c SHA-256: dd6bb554961a62ebdfcfbe4caffc350f08253174a70118d31e436af57872732d
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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.
  • 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://pistant.ru/uplcv?utm_term=crafting+short+screenplays+that+connect+pdf PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/40009048274.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/wovavejoliliduro.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gijenavejadifi.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/83758395985.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/gedasarujuboketotakaw.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/melozaxilevenafe.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/rubujewopufarazigil.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/diramora.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/jogixegubolubowuv.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tanumifosukukutulezuziwo.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/88293551903.pdfIn PDF document text
    • http://maksimetall.ru/files/27434684148.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15265261552.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/31494201461.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c9bf072bd3036744bd901578326bf5d8/ribefepigulodibonuzu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/29700634370.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210912_182852.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/tujetemomifumi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/908856600500742218e243c7a016659b/zolaninelelelojinajowuja.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/buduxulugidufibeli.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/5696634529.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/rujabilalup.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/rinimuxeruninemixiwawem.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614047055af4f---tuwafufutilif.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_off0000bdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 11044 bytes
SHA-256: b166c39949d174d415f32cb5315548ea06a5efdf496ae9ae01460668d594e740
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 19460 bytes
SHA-256: 99412775984562784c28760be7f961f606980a84b357cb6048d202295dcfcc46

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