Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2192178bc352839…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 15:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8b2704a33f5cfb6da8b78c9dc1609dd SHA-1: 2349a7e4906008bd3de439c4cfc317a94596942f SHA-256: c2192178bc3528397d71fefce4cb9798d660176d9138c611a65f2540aed41ea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=poker+unlimited+money+apk PDF link annotation
    • https://yourdentist.ro/app/webroot/files/userfiles/files/85609711945.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/84471421675.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/cdf11ed8e4d4ac7cf4361793eae8c4fc/pelatuwidozivuxazixog.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/16828908329.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c493ddd---wedumuradapaf.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109061306407862.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6177436083650052375ca7da4b1e8e27/mirizuda.pdfIn PDF document text
    • https://led7.ru/file/gofizatapabugiwinovubeko.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/36191980876.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/24727793263.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/62546344743.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/xojel.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/6209211261.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f5a0a8bb8---fapepaxesipoz.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/61250520600.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cmp6hgpc228vf1p6m0pv6amr1l/2958923688.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/duzedigiwelub.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d829b201---kisidovemazezanovoxagupiv.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/tobugetivozelis.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/76867090425.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/lonawovojilexupop.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/josafesaguruwopujofemaded.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/75085162807.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161374e7e18b97---84100921494.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/76201961218.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912232050197808.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/12899956701.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 10692 bytes
SHA-256: 7c5e3eab0132389450d6a9f615525da52c1560e3801b422695d3360b4a1bd506
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 19148 bytes
SHA-256: 71e91189a5692d197c74f2beca53dd2e26a392efcae9fb2e86ba8cd37565778a

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