Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a55d89e959d35a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 03:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ae3ea53ffc85b5e484b4c20d09b6d63 SHA-1: f364e84879010d5759ea149fdcef8a8077853f6d SHA-256: b7a55d89e959d35a93b26eec20e17367b17e78d057f3341460b5269dfb7e550f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=poopsie+unicorn+slime+instructions+pdf PDF link annotation
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/18b8300241c2f0d2f781b0dea6c817fb/99242082064.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1a3a0d66f16dbc803e6f990a467dcc62/suvatiruwalinave.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/faxibanixinak.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624396142jasigoxof.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1hg8s4luhrr2pdfejki4t6pt4d/dabidilese.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098555623859---boselajiti.pdfIn PDF document text
    • http://c-six.it/userfiles/files/6605150002.pdfIn PDF document text
    • https://x-software.cz/data/file/mojukikuxevepiwixowaso.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/pajiminivad.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c40ebab2d---guvaroxizijoterumuxomap.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/safonusapupufipodadoz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2eed4483b---virezinezuz.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/stoartr9r1c681762i61tvilj5/sajenenodilobali.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///jadegiwedisakogegibilag.pdfIn PDF document text
    • http://halaljones.com/uploads/files/8319493412.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210730191538.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/4809918233.pdfIn PDF document text
    • http://195exim.com/datas/files/xaxefupufituwegu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kifosemus.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/4372953869.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/23244766365.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/55642708106.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/81072489622.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/nopidunot.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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 18816 bytes
SHA-256: 2cff7c32b335a3d9ce96534144223b68866bc432c9ab934eef2c32f36210f36f
font_01_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 10720 bytes
SHA-256: 6dd3701e3f137af4879e4e5c7beca77c37aa48ae972bda05cc0dcfc5ef22d7c4

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