Malicious PDF — malware analysis report

Static analysis result for SHA-256 618481e999917700…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 20:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db892c71c1daa9f48d03af8b48f517b1 SHA-1: 7e854e607aca713dfea541daa797b5a86345364a SHA-256: 618481e9999177003412d09509c98660ce3b9041b4002120b7fe3317e8e91f0c
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. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 https://reazfarah.com/ckfinder/userfiles/files/mopivozuvumakaxanizunari.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131716277cee---remojasobipubepa.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/71159088762.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xijomojukuxepazenakoso.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/zizoxubodegut.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/xigofol.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/75817016171.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/surimefipononuwetidusosiw.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/52583412690.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rupaxogawefepojimiropozi.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/gedigub.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eebdf02b7---1569979727.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/cgjb95m4gr2h5k00c3mbe3drb5/24904651380.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/826157315.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/86882758594.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/92875242996.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/53711709971.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/18674519482.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/24623803125.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/rejasajekaresoda.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1858259467613d941b20b5b.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/75126409295.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eb020f5f815ef270bb1411f53fd0f9a4/70813778471.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/90681866241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+essential+world+history+7th+edition+pdf+freePDF 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_off0000c30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30E 17916 bytes
SHA-256: ac7e1526c908c3415c44072c170fe3f6040142bc335f67d3f0da57463e3bf86d
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 10808 bytes
SHA-256: 612ddcdeedb6923114294efc95f07383a15bb34885f62ed924c1d30f7dbdf63a