Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ed8423cbbe450a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 14:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8f754ddf3b110d75d3f1e1ad64311588 SHA-1: 356a815c1ffafe290bfcd1204fb7ce728bced44f SHA-256: d1ed8423cbbe450aa41a26c68364901271be2bacfde66b0fb3caea07df107305
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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 http://gptools.net/userfiles/file/faselebas.pdf In PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746753c2f85---883072707.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/dc46a7830b2ab53c31430802b8817716/robejevakekutinepeta.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/95466057982.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/kujajuzivasikipi.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/24612344138.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a157a9025cff074f30e3364a1096ec4a/tujowasobigubaka.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/jeximaka.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/93962799046.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zukoxibu.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/fokorenerod.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0228be7a4df79397fdf61ed1ac3879be/43833627616.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/36277968711.pdfIn PDF document text
    • https://tantecoccole016.it/file/2098442112.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/70ad45b34812e1665ffa40bd9767bcdb/fonixawevonifutu.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/75868527424.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160795d8b634e5---jejirax.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/kapajer.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608380abc93d9---40305311214.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/kigevosiselegeve.pdfIn PDF document text
    • http://riceart.ir/basefile/files/21329184500.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/34343525251.pdfIn PDF document text
    • https://carlojans.com/cms/file/57480713003.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/tq7bifit5n4acfnkl0ai3t6k76/fijolu.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/44556520181.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/59998437121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dimensional+analysis+practice+worksheet+with+answersPDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 10932 bytes
SHA-256: d59c2489c7b9c08ca670150116575f6e38c1ffcafb2bc45de115617bc0a490e7
font_02_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 18548 bytes
SHA-256: cd8dc160dd66040730e61b4c8d699a11948c5d08e7a0e1665be7ca2c76e6b730