Malicious PDF — malware analysis report

Static analysis result for SHA-256 555e49f32a6ee20f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 08:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 792dd18d560d15371c2144f2fa05a943 SHA-1: d746647d1760f6355de1df1a5be4acd41c27d489 SHA-256: 555e49f32a6ee20f4c9739b522a471e9044b5f09a6111d140d76b18f946eed10
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these redirects. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://drafthe.ru/uplcv?utm_term=plant+identification+app+for+android PDF link annotation
    • http://abnig.friendship-match.com/upload/files/13018531838.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/65138749466.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/93885410566.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/64563095823.pdfPDF link annotation
    • https://rent-1.es/ckfinder/userfiles/files/tapatarorivapodogadot.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/jepesutulit.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jupobakutijupogezoz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161398f922046e---27836822586.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/nigujaperoxuvudugijidofo.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/pokakofalopuviz.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tipefike.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/11717412522.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f87a1afa2d37c60842754a4f73e472cc/75615215325.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/xajixavobineterigude.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/81471176587.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/giniwojipiriremaj.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/bigur.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/tekekepele.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/dulojun.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fa449d3a---gimareromebi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161321d32e4e79---pobesotujekamaga.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6nslfkvqg30266nvmo51fu85n0/mawidoselamawadiwem.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/dijowoguvev.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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 10444 bytes
SHA-256: 4cacfffa786216d8b91298e4a9f7c6139c35fbf8bbc4571901ecc9154e776f69
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 18056 bytes
SHA-256: 9b7e2706eebb6e64d6d932b01b255392cbb8b01e5716f7949fc1a9331df8efe6
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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