Malicious PDF — malware analysis report

Static analysis result for SHA-256 b538c4b270da6dc6…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 13:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e653ebd18939b4decd0a6e1aab14917f SHA-1: 41ae72567208b28236b96cb6c8c1c493485b1010 SHA-256: b538c4b270da6dc612771fdd89fa6b8c0dced3e84b579f295ff25864151d8ecc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the compromised CMS upload link farm heuristic point towards an attempt to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.benyowsky.com/resources/files/xenemizogumagipakavo.pdf In PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/82715065899.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/nisizopitogulipasesadi.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/fotileputegusikuxi.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/94678874823.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c809cc859---wujojezazafekeximomi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/kedurutatobunuvujuzowupog.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109010943341803.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615200a8b8fcc---xikapirasimowemo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419c2348910---ribetefuz.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/notisugubekiweli.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656d860528---pakofajekopubilowetu.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/45742030827.pdfIn PDF document text
    • https://braus.uz/images/shared/file/dekakifadubiledoxetasex.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161538a09cf9e8---kuzulodudemep.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/18876308694.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/81693635514.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/35725446058.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210919025243.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/bugelivewufeje.pdfIn PDF document text
    • http://hkwwta.org/userfiles/paxobafagipejub.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210909070453.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/78680619134.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/zigirabofipemumesidumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gameboy+games+romPDF 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_off0000af80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF80 10404 bytes
SHA-256: 244011ba88f190d04736be69b552b93ce198e2056b0d67ae9c7e62828a850275
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 14624 bytes
SHA-256: 15c7178733e4881e4c2f1e686c2d34c8b4bdf121c376452cbc8155ef3e2becd2
font_02_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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