Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56f37706c4860be…

MALICIOUS

PDF

99.5 KB Created: 2021-09-08 10:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67295d95a72693321da4b109e0237d34 SHA-1: ca3dbc36347f5a692f927726ac6da49539bf30ec SHA-256: e56f37706c4860beb877a2b9acb9412395f48d8850f1bfebbe375523a7b7a5c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous external URIs and a link farm structure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are typical of initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://infrive.ru/uplcv?utm_term=mabinogion+pdf+english PDF link annotation
    • https://fulzugaskozpont.hu/files/gelezinevisezizoni.pdfIn PDF document text
    • http://esteel.my/userfiles/file/39439143131.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/330ef9dd3c9124bcb2084b3e6f029433/romisagibunum.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e1ad471e3f487ebf986329ff160ce2d9/zafixalijidijaja.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/wikuvuwunex.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7f854821---seximagawadukosulugitur.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c4b6518e6f1e41cd4e75da827c32158e/79399825247.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9416f3979---87340825695.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22767f1256---marotigatukopikigeko.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/semutifewa.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/kawivosive.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cccaac540---lufevaxopitapowemixazisuk.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/30809933944.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kubapunimebasatifigaxes.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/72978447488.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3358fb77---vizolige.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/pafafojiwojusomamox.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/39089984832.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/42061600965.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/lebuzoxu.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/xemimitemeniga.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_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 10712 bytes
SHA-256: 6c180efc354d30d38a8b6f747a5750efc58b2a88aa65126a2fbe0a0877bb714c
font_01_sfnt_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 19028 bytes
SHA-256: 255135682c20920d59d1f821c6d185b0f99328210cafa8e1b8425078f7b16150
font_02_sfnt_off00016810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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