Malicious PDF — malware analysis report

Static analysis result for SHA-256 25711f045c94d643…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 07:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ab59dabd2bb08886f1ea46fa97db657 SHA-1: 9aee6a2ce9c0fee50f636ca8b76666c417c3d884 SHA-256: 25711f045c94d643777a7e76088092a13e7fdcff389b69897caebf45e96f0b1e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external sites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to these compromised or disposable sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0f12382898f1d66ecfad799470ef90d/dozoratuduxogirotuxaxasi.pdf
    • http://ash-graphy.com/userfiles/file/nuxujuvojan.pdf
    • http://myphamhelios.vn/luutru/files/26448278639.pdf
    • http://tw-go.org/files/62990509395.pdf
    • https://notrepanierbio.ch/userfiles/file/xonisixowetoduxez.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bcf57ff93---demomezawe.pdf
    • https://edarky.net/data/file/dakabufas.pdf
    • http://curry-box-deluxe.de/userfiles/file/37238820299.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/990fb7dfda311a5f4435db3436464840/70679895153.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094436cb0c3f---97719183886.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b6cca8d6---javemiwasodikamisigoraze.pdf
    • http://anthonyvienna.com/sites/default/files/file/35133470318.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0225219097dc457e45912e433a99a9e9/31745905677.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad4fc4b0d---jeratu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143b73eb32---8923893678.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2bc2cf408---rakerejasapunof.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/padeniri.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee18e1e2c3621be6e88f341ec5802db4/pirovimavamutukigiw.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ccfo43g9dgs7v29nek2c0n7p94/27250999439.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2e7baa30---68263190279.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210602_225532_1555.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a52695d0---bozipagekag.pdf
    • http://smflow.in/admin/uploads/file/wadonuwiwuputepiwaru.pdf
    • https://eravukappalpalli.com/userfiles/file/95381629559.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=production+of+biodiesel+from+waste+oil+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edda.bin
6087905c625a39663806b77613980728add13b06369f386945a6b8a9a5f32c69
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 11108 bytes
font_01_sfnt_off0001079c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 16792 bytes
font_02_sfnt_off00011fae.bin
2ab45e33f3cc011da4e6c9684acd576c0a52875d34f725457ee918de8256910f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 17088 bytes