Malicious PDF — malware analysis report

Static analysis result for SHA-256 204cbe382a6aad00…

MALICIOUS

PDF

90.9 KB Created: 2021-07-26 07:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e1aec7a023d93b1074f7fe73448a2574 SHA-1: d8a34565f97fd1cc063ab9392df7277e18132fe7 SHA-256: 204cbe382a6aad008516a954c9535cd6c8e7e706eec259c076320d841d008058
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/fodomev.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608519a9a7e46---36982375787.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2b1cd32d561f60bfa34f658e616ebd7d/56866805152.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/301bp9e9ugifrimkejhih6qcoo/3233114508.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pobub.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/vagum.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160836cb9f2af1---tonexodix.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/sosavuwodozowaveso.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/73204715145.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9d11823d---kolakageko.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/32832314753.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kafuxasunotegogo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776a20903e3---lazoluzimugiguwagadorove.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/32415979964.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832e00d0ca4---pixesukedimakapepaxajeb.pdfIn PDF document text
    • https://synersys.fr/contenu/file/17246991546.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/79e59d7b896f09e84d27ebdba8222238/7352981262.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/gexinozewetumes.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/167bbfe0491751bdb732a69c321c3940/63023441660.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02113a510---pudib.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090dda5257c9---63397879030.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/006de64ba829573c6e2e1fdbaebdf77b/kakenasasuf.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/663a4b9a0763c9484d75d305c57248c5/36390949692.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/zofudilibitexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=microsoft+excel+2010+exam+questions+and+answers+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_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 17156 bytes
SHA-256: c8b22bba39fd797ab8f21bc3d633abfebe38dedaf46232a9d8e4bde7a1019ddf
font_02_sfnt_off000141cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CF 11504 bytes
SHA-256: ac68085a973480c9fd98de75d06877423485f30b3724786f615cd79ae2523c7b

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