Malicious PDF — malware analysis report

Static analysis result for SHA-256 828a5819227a56aa…

MALICIOUS

PDF

81.5 KB Created: 2021-10-09 21:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e758b4b146f9e325156e177f97ba2094 SHA-1: 5505f7be14f73efee682bc2c1b15233f402e4607 SHA-256: 828a5819227a56aad5b0d94485c110cfd09f3db42fd25a2991a4e26ef7b7878b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for further exploitation or credential harvesting. The presence of numerous external URIs and compromised CMS upload links strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://synerhu.ru/uplcv?utm_term=equilibrium+point+of+nonlinear+system PDF link annotation
    • https://hasekei.jp/userfiles/file/29400128932.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16156ab9ab5bb1---namulakerufotipopeli.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161487dcb6d50d---tufibolutimowijizejonilem.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/64444155956.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c65e34a325---15437192253.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tipifobatimujofamomirunuk.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109290249011658.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/gaxireremakazewe.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/42461374479.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/77773842184.pdfIn PDF document text
    • https://almavilag.hu/files/files/woduturum.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///xujuj.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615a272017d9c---39699502224.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/gavarewudupe.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nopebowevoxesof.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/11279168930.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/naxukifigotuzivodul.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/67991915863.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d9197cf98ab65a2fd7d78e818c5b5310/mugirep.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/wojexekipamufisekaxogeka.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/14706308531.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zolojukikiguvi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e063be7ab4d4eea02e7a1910bf4b99dd/33181194148.pdfIn PDF document text
    • 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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 11000 bytes
SHA-256: ce2a72765c66cac76868e81edc5ee2f44984638202ca4b4045c8cde91e7e4f5e
font_01_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 19464 bytes
SHA-256: c8935a0e1e1af3a64c42fccf34a3cebfc3238d4204a1df8e206626b51530204e

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