Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b10f79a8cbc1d7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 09:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0ef9b00099f0db4c310fd6699aaa30ed SHA-1: e6ca29490a9ae4348426eb5b3b825aa73b36af35 SHA-256: 79b10f79a8cbc1d7e49ad93a729d1fa677bd85ac67dfe41b0628c28978d49043
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://belniig.by/public/file/62607025768.pdf In PDF document text
    • http://flomojapan.com/upload/files/25056795195.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbddd8c77---61445603725.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/nipukeronubitusaw.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///46621103803.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/bojef.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/68315214862.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/tilasebuwejepaxojuve.pdfIn PDF document text
    • https://raljob.com/userfiles/file/96073070325.pdfIn PDF document text
    • http://voijin.com/userfiles/files/56521368484.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/12672459873.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/bokarezuwudekodetatibe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c9c320a2dd70f643aa69643083636942/kabiw.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/rirawarizupesatife.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/14541712748.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137f12a71b0d---14600892911.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/3612635464.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/21865390396.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161457e314568e---bilezetukimibogevaraworim.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457336d85d2---kubapibekomozapowevixaviw.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/98088dd185a3e4de71bb2580b8a1e1f9/77222260126.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/dadivasitisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=michael+jackson+the+experience+hd+android+apkPDF 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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 10928 bytes
SHA-256: f86995e2f57c42b66eecbef1406dc6c4b62768ae032ac38eb4f4bd44695e46f5
font_01_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 19144 bytes
SHA-256: b5fab8c715112097538acd99bd33d761344759f628bea9aa59d0a5a6474a5e82
font_02_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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