Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c097cd05530fa6e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 06:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afd9aaa69018031f3351593033b28f3c SHA-1: 519d55ea41c8c6709e0d560a1860ea4cfc29b0bd SHA-256: 5c097cd05530fa6e195bf8bc4be641e13fa798ab813fd8ac0d1876e0f261f030
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=how+do+i+hide+contacts+on+my+phone PDF link annotation
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/tovigefa.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/61501583129.pdfIn PDF document text
    • http://metallpress.info/files/6999215162.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/domaga.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dd19c38d---30527759628.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/milomadaripuwezowade.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/bafaluvedosuvipone.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tozenazulupu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613604132d07f---mugadanuwuma.pdfIn PDF document text
    • https://emprenderem.cl/files/palise.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/pepexizut.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613771ad07494---zidedali.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/nivujujejimajigesomaxodev.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/sekewuxepopuvozeno.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/vikuliwemurowidutigibem.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a9f5f014---zebor.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74301268634.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109102116522645.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/44239400422.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/59640857135.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_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 10824 bytes
SHA-256: 8e7057e7467942a7670e8c67da06712a60e8f4f572a80dee12433fa2eafcb742
font_01_sfnt_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 17288 bytes
SHA-256: d755b5fefded6064cf72c5555978ec25945a39627f29aa90a9aea7f3829a2f49

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