Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd82b25021a00183…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 16:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eff15c957b7a00c0e7990937aca4ee87 SHA-1: 0c539cf4633136a22e07d17d34fd82eef72a1971 SHA-256: bd82b25021a001839e86ea324d38175db1090e889802de1cf747c0b09d1a3e9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to trick users into visiting phishing sites or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bojovesporty.cz/userfiles/file/zakazujir.pdf In PDF document text
    • http://www.farmaciapenil.es/userfiles/files/96406156575.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/35609039814.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/46253278076.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/13341970751.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/21090176161.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/27953263272.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/47219062481.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/negovikikogisodebomapinif.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4a31f5d1---49547959994.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/pofene.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/rovevibexugetawujiluxako.pdfIn PDF document text
    • http://emaaravm.net/upload/files/43118895905.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/16301347748.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/kufega.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vavepez.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/rariluliviju.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161349959c12d1---notutumaxesinejagob.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/mipuwebev.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/kajox.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2192c16af---80261778319.pdfIn PDF document text
    • https://masihpt1.com/contents/files/83430200734.pdfIn PDF document text
    • https://ottopianos.nl/files/fodaluverixefakewevofamu.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/52871482583.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96e9a6546---zovojajosidudivulupir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=neale+reading+assessmentPDF 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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10448 bytes
SHA-256: 9b97cd39a09a0be0ceecf750ec1086e7fffd9ebefaa1acb70101e60ceed2c58a
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 18844 bytes
SHA-256: a1c1759d092a46cf034af7b34b78ccbbdb518045c5cf6de156ba904029c8c2f6

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