Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d411c0ce4d921ed…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 11:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d65b8567a96afea0f0b341a531968da SHA-1: 54c286559812cbae48c7b2778477c5c8ce654a22 SHA-256: 9d411c0ce4d921eda79ecaac9078e1ff3e380f8cc8f700be1905c20359c69b83
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sakaryakasaplarodasi.org/userfiles/file/wudewapalupajuwibomite.pdf In PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/48516410851.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945d5b20c54---wirotukivenu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/07shv8gtf19t08cr1l1cb8bjjs/92808951941.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fff38c42c---besatopizana.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cec88edb641149b09648b3f46e3c987/71221331336.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/rojox.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/76284955213.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160812b92f3be3---7283414706.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/enjhuqaa4e1mgct2c2dk90eh5c/13975196495.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/31730883066.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0157af2f2---natozoxozujutak.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-24/20210624075707716863.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2d6f2a43---rokor.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/lezulabumazonuzizam.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/mekuxapigovumefiruxenar.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5ceaaq1o05jg4ih5e7lhh242fh/gorupewisuzetudupuvexo.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kojegigejotevej.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/zakuluv.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/7641ab6566ecea92243ff8a9136d4438/nazesisiruguranav.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fuminexupebiwop.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/korakamoraxi.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210705_064735.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608220fc6d95a---xolototebojevadel.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/90acad90a8d9d2a254c999b9d307ed07/40020602220.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/p3nsltpf1t8pf8emhkq7s14vfl/98362328046.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dppij6ev68vb1ei78nln2nel24/kijuzeregusojuzuzolazizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=manualidades+por+fiestas+patrias+peruanas+para+ni%C3%B1osPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 10788 bytes
SHA-256: 722e1e241d57b415e3f56abeba3aa1270835c00ab46d7d1725acff85ba2c30a6
font_01_sfnt_off0000f33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 18548 bytes
SHA-256: 11e6b668616860f29d7bf634d95ff020d0cf0419f6dfbde9a193fc87e0d70591