Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd3aac786808bd3…

MALICIOUS

PDF

87.8 KB Created: 2021-07-30 13:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b2134f588e2662dbe261d86dd913c27 SHA-1: 2cb4fe6b67faaf0cc906bae5a9035acd35e35b59 SHA-256: ccd3aac786808bd398cf5cbe815070f353825043f0a5b9d1fecdef92968f4da2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=pirates+of+the+caribbean+4+full+movie+mp4+free+download+in+hindi PDF link annotation
    • http://simpelms.nl/userfiles//files/59430159299.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b2fd64de---xanumiliga.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160988498cab86---79613565693.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/98ar7i5k3e9od437km097pmqhn/32791503722.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e36cdbb1d8b---wojawolabiridomudogizas.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/40469234711.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada99378cd---98875402568.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/5197959556.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/turupuvurowifotiripekipa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b49098356b8---sililidefe.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3a12317407a3d4b5bc79e8c62150952c/53340848034.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/90662794176.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8955dbd882---vufolovirajum.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/pubeluvafuz.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fokud.pdfIn PDF document text
    • https://etimes.mn/uploads/files/40566961751.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871b1227205---zaderi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e8410192---waniganosukegazape.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/49604193948.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/40168314904.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/okc1cigulk4i69k9bbrukn1ngu/8178313630.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3ab818d5a578071020b3e47080a3ec48/52809229118.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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 18764 bytes
SHA-256: 867d4c93e06840ccc16026590f3ee62526a535435cbe13aa5aac02af9cc47066
font_01_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 11356 bytes
SHA-256: 110db2fd2ddf5a6a8da00545fa7893d2b3adc2ae2ffe23343c4127a47307c073
font_02_sfnt_off000138c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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