Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd38926fa39d2f6…

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 14:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4498bbb6fa7f08704b154e20be5a15f7 SHA-1: 6f5c8116dd45780952db9adde0d423c8c2807ce6 SHA-256: afd38926fa39d2f6eb20a6bfb7c28e930a82f0a0ee575f2dbbb3f5f67016d22c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that the document is part of a scheme to distribute links across various hosting platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=best+wii+u+emulator+for+android PDF link annotation
    • http://aucoindeshalles.fr/menu/file/betadutonezonukam.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/tokuru.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/62726368624.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/98290608872.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a82a46c2c---5292058203.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/lesuxasotuvutizodepomasa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fda58642c---xatuzema.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/4588800390.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bddaef98a23---kiziwak.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5049d0201---2119684694.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/mokepadusunivelagobuzanif.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/loruzupukokomotalerovog.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/51a11c10422fb1fb09016ccef913a5b6/4694452591.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/salubivixanijid.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/60759277501.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/87533033379.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/d3a774vva5d1rkkofra41vli2r/kefasivud.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/11705652019.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/wifozimama.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cb6fc4351---32289866714.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81945608358.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/86123992888.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/bujubufuzuvuvogexesujazuv.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/4317304572.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_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 10752 bytes
SHA-256: 242f31deed0481379e9c24060fea6b0dc107f99abfc2955f0a9e13a040902ba5
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 17484 bytes
SHA-256: 7b2c7dfe5c2257b89792f65b277c44dca5eabce278d3bc42b4323b999e56f012