Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f45cdbe9f67e7c4…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 08:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b36a3f9c08a5ce38c0410f95f435a9aa SHA-1: b59dcb0b679fd8c231d5e7d7cbdbbd0f20b8d430 SHA-256: 3f45cdbe9f67e7c4d8dc5d0301207363a73085d6d9659567d1a883ed09809d05
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a lure for users. The document body is unreadable, but the presence of numerous external links and the high confidence detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/940i7358sp4p658mj5krrnoq0s/jutamatorarajebalez.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033d20f75c---24955667727.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eff7fb8fd7ab96cbf3062f9b254120db/wotebunezuro.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/99767289299.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089323b24d87---fifowefefuluzewike.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/88774751950.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/18458357933.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fa1981663---10636524664.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082acca33dcc---63999124398.pdfIn PDF document text
    • http://wenxuezj.com/images/File/saledo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b4250d31---39268499220.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/53209633676.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/d3cdpkcmrravm4b2q4fffhkosj/15943398750.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757588ed739---63475583835.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/m5u4c5h9n1419se35cf4rajb88/12531460980.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/blruqrs8fesd26ck5o5p9rcaft/kisolijufimofofemezedulij.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608903ff099c7---74222005408.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/68a5cb561ec99a0cd40ef220897d6acd/8061210937.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cb01b2e4fc46284925cf649085f03d9f/7722882949.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4a4b2bd9---61904629505.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/20626264188.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c308f708ee3---koxipoluwikavuvepelemut.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700998171cb---59369257701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+coins+daily+spinsPDF 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_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 16968 bytes
SHA-256: 774b9dd94322fb8c8acf699e02f9b155737879db8475a96a356d332835b16c48
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 10500 bytes
SHA-256: 3e500e170705c1cab4f28c034c3011b042c7367d5ed93f3055ffa92ebb6d1195

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