Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a50281d21e0603…

MALICIOUS

PDF

88.5 KB Created: 2021-07-10 01:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c4587f2b6686debf08de31f5fd6cfe8 SHA-1: 1e4bca2e5539b5a12a2b626a43e9c79dffdbfbd4 SHA-256: 57a50281d21e06039d3cdc8accb268c8aa94b2c8184799b817e18bd6ec59c6b0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/nect7pc1q0qekjkdg4999td883/20183669437.pdf In PDF document text
    • http://gesundezellen.de/neu/userfiles/file/wuwomelebitijube.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/p23hkqgpr30k5l9801nq1rhbc1/87168394085.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kixedive.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zosizusuvudigeti.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/903dd20e1c4d6209cdbcf2192b2c6e27/nipodejivewekepin.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/4577406035.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tg25bvecvg9rvvtp4328h7lbee/nezajam.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/419ce261f2068566d285990f783b955c/30838064328.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/baec9027ceb449f3ac227d7ac818a30b/93161647345.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/klftge33qljd5dmkftcm88skq2/jovulalepovegesaxojujugin.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cc5a97a9f021d513f23f14f543785e63/bamurifuredefazokap.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/99013374808.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/puvaguwusugejofe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a60f75336df61e2ac563c3eb25405219/sokuw.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/jileduwomefi.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/98015898474.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ee7039a146923f80b0a72833f2365e61/vivamedidopoxozidewabezu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/h7pgvt24a9449mhmmp1hv6s6ee/20734887274.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160712e1d9c59c---92640479016.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fhghv7obt826tigavp7kuo9504/61999957749.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/44742184208.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/46018092572.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e359c101829545dbae8731fb2f9aa247/gumobitutujobasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=honey+bee+body+structurePDF 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_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 10408 bytes
SHA-256: b62ac28aee91112f33d8cd8e6a825ea7b4ef2c820ad4986293ccebc76c28a2e8
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 17400 bytes
SHA-256: a48bbcc2ad8ffa7fe7da8da8b063c8b7f1a114f3b2a7125dd8489b9ee1d9b7bb