Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4129afbd76fb2ba…

MALICIOUS

PDF

83.6 KB Created: 2021-07-15 12:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2653dba0d5f04ff0d4e7af10f592a83e SHA-1: ee7fa0d0c785c02a1be4f89ec45a6c4bd3ecbb30 SHA-256: e4129afbd76fb2ba07fb43da39ef167fefc988e3aa7fd0bf7657ec5add8cd262
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The presence of numerous external URIs and link farm indicators strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=hysterectomy+remove+ovaries PDF link annotation
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7c34fb1f---vavizujeminifudewujenozo.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/nopasotopokij.pdfIn PDF document text
    • http://klefmarken.se/upload/file/68094304271.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/32555357589.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/vejedisafidaninepebiranis.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090eef38f07a---xolelivajukos.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210601_222952.pdfIn PDF document text
    • https://iword.de/userfiles/file/48127715424.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa8d0dbd4---79487789380.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/boqglbigcvmh851odi34n69q5h/24239067120.pdfIn PDF document text
    • https://tsegypt.com/file/72692777813.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/javebunixeg.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3sobipq0c51snbhievb5721nl6/89457288491.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wukologadij.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/5e6978243ca6940afed22cdc6946359c/51962822224.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55e73109c---xeratetesawuvipaxenejab.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754734b1c10---21264008386.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/55556376062.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b2fcba76---44494449299.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88fac74e4---magakoxosi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6tvatrvlul8al3i3tsnmkdqff/giritanivasibe.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/7a9d88999c12aef152e9315633838903/muniv.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nlir6he1518lpv0a848bcjup6h/28219870814.pdfIn PDF document text
    • https://hse.tw/upload/file/sajemuvebezawi.pdfIn PDF document text
    • http://banghenails.com/upload/file/fukazuguso.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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 10412 bytes
SHA-256: 50cda0f9657e2dc79d4e3e81c1a83dc15c89116c81100758c400dc5322241570
font_02_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 15808 bytes
SHA-256: caaaefeed2d9f37bd400fb176a61fb2ace610668cc10fb29a0826c02c0bcb104

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