Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b60b63ef96000d6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 07:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4778d8f7909f1e1a89bbd589f759f14e SHA-1: ac7a21dccfee0fe336b497f6b8b8d48ab869b9f0 SHA-256: 6b60b63ef96000d6281bea1746e18dbed9d22095be3d7a59085b7036d3bb47db
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier strongly indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=icaap+report+pdf PDF link annotation
    • https://etcbt.com/userfiles/file/menawaribozopigivupewokom.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160778d43da786---raxoruzalukuw.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/13811354022.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/60849833741.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160769f74d40a5---vepatozubore.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93f575dc65---45184391097.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/ripekiguze.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609066708210c---navolipivinivuvuluvota.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6b796252---44751581005.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/51890382101.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/75063755f42f28d29e80d3303f1ee924/xeduxozomaj.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/mubikog.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4348fb46989d2b2ad111846c3b15490a/gabigunekax.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a28cdec58eb---xakimenumigujufurulazalam.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/vumixela.pdfIn PDF document text
    • http://eternoohydro.com/d/files/ragivegak.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/48540319209.pdfIn PDF document text
    • http://enricobarraco.com/files/pokofonekijudegada.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/13991920531.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/25051707503.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/916f8e452b971d18e1007482289d47f2/manigepozowemotizo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/n08ncbhg8kgauav214908j8e76/vewurexafume.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a9dd051b---15278044148.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_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 16956 bytes
SHA-256: 667cab08ce7f8eb2c3f65a84101a59a19b6799d0e99a23b1f8acf1493a74fdd1
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 10156 bytes
SHA-256: 9354bd108b7ef366cd0ecb10885f850b06efb9f7fe82c5fd57b27dd7d7a2bdc9

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