Malicious PDF — malware analysis report

Static analysis result for SHA-256 18daa394fca19be0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 07:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e45ff11e6623007676bd9a58a109e7ae SHA-1: cbe731245ba25afbc89c5b7d5743a53d8a00fde0 SHA-256: 18daa394fca19be078dcbfb5068765d919650d966ac565c52be385d9c9a9a2e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains. 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 malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=shareit+for+android PDF link annotation
    • https://biholka.cz/uploades/userfiles/file/jadedepifunuziv.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vuzotudidoz.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/18226547200.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/37699301516.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161402191100de---denugufu.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/podixejegomegamunab.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/63473797259.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/47166799335.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba93aed6fc346804c7b682eacb34d2e9/44813562241.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/de2597da1d39cebca78b582474a22005/58306993635.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/78872744940.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613542af22634---vilalopumaxebamigile.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/73381193058.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xowajorilijazesodopaz.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/27499473131.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/puvit.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/22702958450.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/82353337808.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/jowumesulubefodi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7add2354---kukafiwi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/aab8ffae746fdd77cc73261d60169c70/51601418345.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ad042052---56906711523.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/95684234953.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/rufulajusaxudemovodinubeb.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_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 10312 bytes
SHA-256: 675a6725a099d9836d84acc60a317643d498241f354c01b529e3759474fe84d7
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 18116 bytes
SHA-256: a8d615033f8ed7ba26416f745fb61add1a8b2601c2300c7c0b580c9b420929e4
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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