Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f2d0df2907796b…

MALICIOUS

PDF

77.0 KB Created: 2021-07-03 14:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b86b082ab0aef1cb3416e0726f3d47c SHA-1: 4a67f8102e54a3c7d4e674cb5ef94bfdfacbb2a3 SHA-256: 51f2d0df2907796b1dd4200f2acf8d071f7c4f4e5a6a6fdadc7dac2f11c39487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to malicious or phishing content, a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090158a585dd---62023416811.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfce97ac4f---talozonate.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4876dbc05---sasojineponogoneliwexix.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/48465600370.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210626_5B10DED0C18AE803.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oieno1vbl5m0t20ps680e2a2a6/varibikukejasasezopateted.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/sinesapadetemesirek.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f197efe9e---19031732458.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/ganujegasujeronedevemaj.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/powefa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50cf41028---sivexuxexiwat.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/juzigazowu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/39151f9e9bb25cc8eafec3bd2e0efbd3/wasigibiga.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jipozisavudokobeleloxizem.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160814ea476b28---74692466658.pdfIn PDF document text
    • http://toonesk.com/upload/femuzajatoxamukozalod.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kiwozubulosodip.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a2b4c3703---17244737812.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-11/20210511230823755464.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/31abca8a0c76978ad41a9297093a5753/66717104385.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3cgrsnjrbccfgbuu8qlgqj4vf7/62635791560.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5d97dc40abeccb6db7abcfe04671857f/kosufagira.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/bf8ca3d407f479fae172b02fe8fc14fc/60571017855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chanyeol+and+heizePDF link annotation
    • 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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 10184 bytes
SHA-256: fc86a71a1f609744a9fd06755ea35fb3b906b1a9569f323f33b62526d63dfb51
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 16636 bytes
SHA-256: 2bf80bc08b60278d38add2fad178123d3085c89c98e1e08783f407c74ab31c0e
font_02_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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