Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f392724caf4775…

MALICIOUS

PDF

86.9 KB Created: 2021-09-03 23:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 230aaa4586158eb0f12cbd65d4c035a4 SHA-1: 64eab2a0b552ac1d3778c1f09330f4943a72b2e7 SHA-256: d5f392724caf4775b9dab3c5250454f89511d751cb1501d119549eee2dba6837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ieeepes-thailand.org/app/webroot/files/files/lapiwepodorogiraf.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607197166cd8d---litofuwu.pdf
    • https://drrajanmahtani.com/userfiles/files/90659159476.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/416c0b8936bd0b226a5bb835908dd5bf/71908414865.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eee6adc7c---luduzonebozez.pdf
    • https://muguet.fr/sites/default/files/file/52747232019.pdf
    • https://digireg.sk/upload/tariferewesejonasap.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/jedaleduk.pdf
    • http://velocimapper.com//webfiles/file/98909286284.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9bc622b0---mifisopo.pdf
    • http://sicilalluminio.it/userfiles/files/lalonusiminiguguge.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/nodixipufufan.pdf
    • http://albino-pitti.com/pub_img/file/gividiziledezexawitam.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160db9ca2f1e66---rudelazumovimejutogutalul.pdf
    • http://the-bom.kr/upfile/files/70530277409.pdf
    • http://sendedianqi.com/upload_fck/file/2021-6-25/20210625090315143997.pdf
    • http://www.bash.cl/media/file/36607885746.pdf
    • http://sethhukumchandschool.com/userfiles/file/63605497234.pdf
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510090212751964.pdf
    • http://trip-sale.ru/userfiles/file/5515233490.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e3emn096k23th18abe6f3e35r6/kulokakulokemo.pdf
    • http://air-ned.com/uploads/files/53451416105.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/1pmi08r3ug1oacq15ej4tpirm6/litotijapesasos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=translate+pdf+document+from+dutch+to+english
    • https://tes-sys.com/uploads/ckfinder/files/20210629/16249221549706.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin
8c611ec56742877cd20b62c6b25ec8003aa1273f1c30b42958e92b95a31a1eee
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 18732 bytes
font_01_sfnt_off00011c2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 16792 bytes
font_02_sfnt_off00013445.bin
21a47229dd876d935ded03804c0bf84d8f112b37e996daec63ee8b6258d44d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 11132 bytes