Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff11da2cfa3f1621…

MALICIOUS

PDF

98.1 KB Created: 2021-08-13 19:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 233659c5a36aebac48dc3646f2ba5ad1 SHA-1: 6f53498aefb867e34fb8e0ef7fe0b8273c40e99b SHA-256: ff11da2cfa3f16211f818c121c55262cdbc23a25233bbb038485c05f21a4e4a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b772e68b1a7---putiwupidat.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/nevaxupabi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f02aca900---92539993610.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/30990409530.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4650cf1d---bulidofaneni.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509a75c849---togekigipa.pdfIn PDF document text
    • http://ahchala.com/img/file/guvolaxuxi.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c3ef7e562cc450f21a21a1bd226141a0/visabibiladetamarer.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1afb8f62fc48c1d02a1958c56110a724/gitoz.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133ebad637---zijubezibaveraroxalewa.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/ledeforobiwabojoluv.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/33837709586.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/mazubu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7976baa3---39349653045.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fovenotenapevekun.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/pifosasevebujukisugumasu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607191b3270c1---xuzeluxigus.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/zuwufodonesoxo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0b139e8a7a3e6d34c67dab4b46f9c281/26334527565.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/xasofamerimedebok.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8136ce490697bea3d8587fa31ed90756/xanefunagawuzorujoret.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/1004306753.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/vixawesepatovotipug.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/93597439302.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/rojosawurozapiwira.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/37474907880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gamejolt+slendytubbies+2+multiplayer+androidPDF 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_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 20012 bytes
SHA-256: 5106cb0e1b2aba92ce248f8b45533ed80c15d3496bde8360933e5dbaf8266df8
font_02_sfnt_off00016000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16000 11196 bytes
SHA-256: 3ee812e44024fd972a7df14c4875032c0b61b6d4529b9df7916ff12c36f74482