Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce3821a99168389…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 06:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a666d20df5299a5069e04df5449333e8 SHA-1: 867dd1ebf1189a34b28957260dfbd333e87376e8 SHA-256: fce3821a991683891b731f910ebfb2da2eb6828b937efdcde0afd1772c72c2d4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=algebra+2+discriminant+worksheet+answers PDF link annotation
    • http://flyingcarpetclementines.com/userfiles/files/kajurimizuginoboz.pdfIn PDF document text
    • http://texmet.pl/userimages/file/valuxazifutidej.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076595cdc543---zuxepikogesefowexiz.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c864904765b---ledezekoxuzulinavevidavo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a0549e49f249ee1014d8e134c29c4e49/89644711719.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6777417e1---56113590805.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/60928230036.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1bce6cc86dea137baea1601b0d41d082/kijodozavowoxano.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nonubupimifajugufa.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/xuzudulisaxu.pdfIn PDF document text
    • https://aitalk.vn/upload/files/15077142595.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/71766319811.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160744a6e4ecda---rawozediboguvanubal.pdfIn PDF document text
    • https://hoongnau.com/upload/files/31402949220.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/todexuwuxuvu.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/80720426190.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wurunateb.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jozalemedeluxorimenikebe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c73dd00b2effeded5d8ccc07afdd168e/wuluwe.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8f305bb88f522795b486817a61271508/metedisuni.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/56306074893.pdfIn PDF document text
    • https://egf.tw/test2/images/file/nabavidewawovi.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/78550700938.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_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 17844 bytes
SHA-256: 4286e015e7822eb219cb712674987a6accd6b86540795db88ee2e2fb9e1c009a
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 11236 bytes
SHA-256: c55bd1d3f358c9c8838719c093ecb3187cc2408663e9354568cfc62c1115b2df

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