Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9974022f518955…

MALICIOUS

PDF

231.5 KB Created: 2021-06-30 09:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58e911a31bf6bf66db9122ede64566b1 SHA-1: 0efcb34ce558e476a1f0c323b9d3a3b30c1d7744 SHA-256: 8e9974022f5189556f567b15b067bcf7ec8af18865b4a1ec0e1731ef96fcbc2d
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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 http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaa336d120---xoluduwow.pdf In PDF document text
    • https://xlspandoek.nl/userfiles/file/xulumumekiz.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ec32b120---tujifikivemovada.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5f8ljmn2okjofn3c1oc9so1bn7/mazogodunuwi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6661e97fb---349190997.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/15012368547.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gpd4ns2e0hg6n69ecj6pst84h4/povajebakonolep.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/36a7f2c6cfec958a46e71fb772e5347b/98480217528.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6d36638f---49925713468.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6llcejg0gpool1t893chda0ej6/72667546676.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lapasonipetakopimokaru.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9b833f6fd31c2b6277d71b297350c52/27115257627.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/p6j51l8srkpb3rqi9ap6gao6p3/55308655972.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/90288d08a7d100b100b4db69d4b017f8/jugixuxilepoduvor.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/18287036259.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/accce8ba95ee40adc260975ed2780d10/fikubewemogugozixusonimo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/ditobagireni.pdfIn PDF document text
    • http://biosite.ru/images/news/file/98958231959.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s7vs1qho9c5frsaviil6j44re1/sedegimi.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/68298588056.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760a3dada4---jofusufuguw.pdfIn PDF document text
    • http://jarosi.hu/files/file/81296160748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=blessed+by+satanPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c66372c596432aa4e86166eef73b3539/putujeke.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_off0003307c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3307C 17728 bytes
SHA-256: 1966d3c9e6d902494d12d8d18be94a928495a8bf68aec5e75af7b8003542de0f
font_01_sfnt_off00035f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35F23 10236 bytes
SHA-256: c20db385d824e0941f6c0dc8d907bc5b0b39da41e863e84850ecb6ea18f3354b
font_02_sfnt_off00037657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1