Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a84440201e209f…

MALICIOUS

PDF

153.4 KB Created: 2021-08-14 16:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5dfe34b3a2d6fec5d4a786b02ff45f3 SHA-1: 7c8c25fcf6d1522b3943b007e4327f6603280283 SHA-256: f1a84440201e209fc47082a0eb1e4d60a2cc83a12dbdf4f4cb41ddc4b875136a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting vulnerabilities or delivering a secondary payload via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://woorymart.com/userData/board/file/89735155176.pdf In PDF document text
    • http://dieta-plus.pl/userfiles/file/rarabifojagulu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/pikerotomof.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/26812520298.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f8fa1a0d---refis.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/rulawusadadu.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2d9a366fcc333a7aee18bbcd94e0e982/kiragage.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee833c513---65121725214.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc7f8e83b---17014501533.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e7fbf3b3ed1f4bf030f89a31a90a8de4/9310864439.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/45514021610.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/fivenutagegexarasedot.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7fb81a3f8b---bozugilosap.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/fujaz.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/60217253591.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/95007260886.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kakidukonu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/d9cmk8sdje0qgrfavpm2v9gnm5/gugumiganezazisewexanusas.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/nexibododurimi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/tedudalozejavilaz.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/miritaxi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2c5d844fac4a353d55499530d87df6ac/pejipoz.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/74944858051.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/gupivenubemu.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/kaxexejemasosedozekesela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=livro+o+candomble+bem+explicado+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_off0001f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F19C 20696 bytes
SHA-256: 3a6e880826d5de6ac7bf03958d132ca4e886969bf530ffc4cf1afc6ba47ed3eb
font_01_sfnt_off00022422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22422 10780 bytes
SHA-256: 8e044a587aa5fa52669df7e21518f27e902d39518d180cca1bbf723cba4ea691
font_02_sfnt_off00023cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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