Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f518e837d98b54…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 03:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b9f40c6153a2dbcd6b09fbcafd78672 SHA-1: 9c0aee705b70cd6b67ac88eb47d068513055c6e0 SHA-256: 51f518e837d98b542188d6f55405f3aa8a640145a1ed7e00c30836b17e814dca
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://samoinstitute.mn/uploads/assets/file/43671668691.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607220dbef280---pujinamulilizo.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/jesatajizurofetetugogoj.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/2469364445.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/golidarakotibulogaxur.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1374749068611318edb9942.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/sizupalovofewapezisaja.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0d252a8b---gokuxofuvotikuxokawemene.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gufadinadeza.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9043b75a1---21806901304.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-14/20210514115159306319.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b93d58bc0---tidapodotamizodixejalole.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/69600681447.pdfIn PDF document text
    • https://raljob.com/userfiles/file/xexunajekirosigazoxo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119478c60bec---sofawejenasa.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/miwoxasomopiro.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1e8de386---wugosamat.pdfIn PDF document text
    • http://mlight.cz/archiv/file/tapunovamopagirun.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20218282048102245.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/d6n5t0h8kr3kt4nmu1f3014l3h/zuwibutiduduzefo.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/mugobavomile.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/bosuvuzore.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2427a2f65b---tibujekafugulinigagave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=posthumanizm+transhumanizm+pdfPDF 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_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10744 bytes
SHA-256: f6484e0ee5d2272681b9908c271e20d7f550d0001cdc4f2d92e16a5701e9a84f
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 19964 bytes
SHA-256: 794ade7d65d4da96dd9f8fa4e3723aff17c927e605e75c1302b55d9733d1c710

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