Malicious PDF — malware analysis report

Static analysis result for SHA-256 2197a07316cfa84c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 17:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21a75db9df647c226680d538a4cfb2df SHA-1: b955487abca4511d56fb6fd5797acafbd3a2ae32 SHA-256: 2197a07316cfa84c465bba02c9bc4da1cb55aab387ed20c179fcdc6ab9b84888
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://omonetach.pl/foto/ilustracje/file/16888618639.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd21b798f4---sowaputasugesux.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/tesunun.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e4b93aad2cdb63b34a08745583f52f94/mudusezivekuniderajoniwaw.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/2254891923.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/varakisokiwede.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e81d6a6e---xesiju.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mijejiwamuzededatapimob.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/91926992323.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/29134652521.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/10343064622.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8efe2c758478cf523c41fae3a813ff02/pavilifoku.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0aaf3aa49898854d0bcdb97caa994c06/vetujotojorevod.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ee2560d9---57675934323.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/81314123291.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/460a67564f811262a8407c5d0bac0512/30837545140.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/pekalogugebonefa.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/wusoxuvuruzofopogo.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/nenewapabolopelanuso.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5569ec120---toxubexifalokemug.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/61066723571.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/fezukadavazapane.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/46198994619.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1a8156a97efbf7bb1939bd3c70d6d12b/folido.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/21100062784.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/sofilifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=residential+building+construction+process+pdfPDF 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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 11080 bytes
SHA-256: f65f70a95f041fd5bbc9243ebced15569fa4d4e019fc7b0dbd5cdaebb02c1f20
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16460 bytes
SHA-256: 7156fa77cce9674ec235cbf1bdf062d166f2152c063429f0af094f8ec3ff4899
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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