Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb57b8ef924f3ea3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 20:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0081e71f7e3d7d3bd3882ac4f716a464 SHA-1: 9f5ac3be6b916b8a1b5e226485c1b9b938627226 SHA-256: fb57b8ef924f3ea38e59f07f3dea0708bcbcd8f2deabed52fdbd1c2082185cb9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

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 https://nurea.se/currency/userfiles/file/99504098657.pdf In PDF document text
    • http://needychild.org/ckfinder/userfiles/files/57426287813.pdfIn PDF document text
    • http://cpviettin.com/upload/files/37469097059.pdfIn PDF document text
    • http://dsfly.com/uploads/files/84863321797.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/forebilowakajoxus.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/30448316513.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/33814293759.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/89647759523.pdfIn PDF document text
    • https://laser123.com/geektic/files/vanenajivodig.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/55411663023.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/52258472012.pdfIn PDF document text
    • https://eventaipei.com/upload/files/pepidivizufitote.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/51411628170.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/xiwetizomatuxupuwepo.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/pozagemexovijonasuvoba.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/gusepo.pdfIn PDF document text
    • http://medi-sen.com/files/files/86324894983.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ldg6hiarvn11q90jbb9qb2p16/14556498697.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3324e820---92933336962.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6aob7nhkj5eom1uqpe6233sroh/61953015318.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/rameduzarowutuvitozaralej.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/mojewakutuxosutubatolufa.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/1411665216.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lixediditekenikanozim.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/zakosezekademomapu.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/17612922269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+update+apps+in+my+phonePDF 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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 10800 bytes
SHA-256: b31617d777ac75686d20f6b11334a040d0230799f224c15b456607ff787589d1
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 18160 bytes
SHA-256: 4737887b2be3183fecfba58994554b69aca91bfa893db2948c3c7adbb6731ec2
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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