Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a930fb4c453ea6…

MALICIOUS

PDF

95.3 KB Created: 2021-07-05 14:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 42409730771025caeac684fecbc9a8c9 SHA-1: 15bb666d6b93a1f7806ce9e45ecf2e7220551b97 SHA-256: 67a930fb4c453ea68076a16ae3afc954549ea095e5ee6083f006891a55d85983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The primary URL, https://irlanc.ru/uplcv?utm_term=persona+5+devil%27s+dictionary+answer, suggests a potential phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://irlanc.ru/uplcv?utm_term=persona+5+devil%27s+dictionary+answer PDF link annotation
    • http://telegid.tv/userfiles/files/makuf.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/0807b595c0eef515d7b54e39efc13879/sitizekimaxixosijemop.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160810b15a027a---xakokanorejibigemir.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c88d96c65---65514764894.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e44uc2f4apipu8tqo5ueeff2nv/66665154591.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4b8pj37o23r6vuogfm64ma3n20/bujemuruxet.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sijapaxatofeso.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac940e31934---39637582982.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27870526b---72206075290.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/wusepab.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/dd8473eb1327688a9285d37080e2ac90/revevuzewawebugana.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/b0f2fac73eaf87e98aedbb93184fa161/58472840569.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076c53ecf776---45208648879.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e1821f3da---doduxabipawipesudijop.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/vegijesubudesosawevezijaj.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bff291c46---85783567833.pdfIn PDF document text
    • http://ozari-ua.com/files/file/44376627894.pdfIn PDF document text
    • http://digifast.cz/userfiles/kanojofukuwatebefoviwidin.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/renadibipezip.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/be5f23c55e9a207d5e20d5b522a6121f/1096529490.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7516840637---pixix.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608402264c59c---xafaxonakebugebefive.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e11b51f104fca7d66bb3865238da3a09/92843898123.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcb9cf952---lonuxusog.pdfIn PDF document text
    • https://arendic.cl/files/nipuvorulexupa.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_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 10796 bytes
SHA-256: b8b5aaa4f2c2e3e071e50ea6ec8099de9fb00b8353d92df297f15b9d31bd200a
font_02_sfnt_off000144c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C1 16708 bytes
SHA-256: 696361c49b24d0866053af297a0dbc890fb5050b562ec688e7d951c6762a7a32