Malicious PDF — malware analysis report

Static analysis result for SHA-256 40150967c7bc072e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 22:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09802befc7da2c292735de92ef850ee9 SHA-1: 5723c1f154d5d3cbfa3a523ee215c6f090b7a72b SHA-256: 40150967c7bc072efaad34cf782a224820f67b4972d1d4807bc18f5ec236c256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=copy+from+pdf+weird+characters PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c934f8b2abf---97275857450.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210808234835.pdfIn PDF document text
    • https://webhosting4.net/media/file/69013205974.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f5c05313---13895350838.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d029b0f1---vavurosu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mdois18vus5asvh7a90lvk1lj0/54525194374.pdfIn PDF document text
    • http://eternoohydro.com/d/files/kibirine.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c122fe6368d---15383971611.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021070923273773499.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/lepogizofawigu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a829d7e234b---48719479157.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/88080788000.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/gobajelega.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f07d2e4a4---22101818186.pdfIn PDF document text
    • http://alkanboya.com/files/file///lufoxupowufukilogidiz.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/33441931846.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c6b8424cc180c7fe9a22ab64ca22466d/vanuzix.pdfIn PDF document text
    • http://aimic.com/userfiles/file/pekusij.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qejqj7s8vrtlado35jtridn56h/1960156944.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/92096478887.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418fcefb61---5603158441.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b5415e8f7---96111481936.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/12716278780.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/59590451280.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/d3oas9ilms92brqkajbhvt3lr1/sizunijixetu.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_off0000cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 21344 bytes
SHA-256: dc99d125e7a422282f6145ba3c448f996a6c939e6420bb13c59e045517a01cda
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10968 bytes
SHA-256: 78392bfb47ce239e2270b841850212ec43494e12f40c28a8e9b2f9221b292a8b
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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