Malicious PDF — malware analysis report

Static analysis result for SHA-256 333efa8db7e7f93a…

MALICIOUS

PDF

72.1 KB Created: 2021-07-08 16:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b7ae3d975354bcf8b89f0579396c5f42 SHA-1: 0243c0b6694c5759ecaf3a11efaba28b4bbd1bce SHA-256: 333efa8db7e7f93ad7793882df1191e6c6d7cc0617479fb8989e649e40b97c9c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The primary URL, 'https://archism.ru/uplcv?utm_term=free+robux+for+kids+2020', suggests a lure related to free virtual currency, a common phishing tactic. The document's structure and numerous external links indicate an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://archism.ru/uplcv?utm_term=free+robux+for+kids+2020 PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098167ee7dcb---likelinapija.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/20/sutududalusolowuvug.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/87408584161.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ff3c1ab1---78084034927.pdfIn PDF document text
    • http://amandamaitland.com/images/file/zajotazozisejupetokoxiko.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/34157563348.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e68127f3ae8dfa045f8a2c6139c3620f/3550242548.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/zipufasifonulamig.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/65918227608.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018cf8add6---80290858602.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609458ac3383a---44228012499.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/zofutadapevanegulizasama.pdfIn PDF document text
    • http://brlairport.com/images/file/53145067783.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2630cc9fe0---batakuritaje.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/93787fbbce768240f04d1dbcd63b13ae/rekupagofukajasulirugis.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160856af03d0ab---80427519799.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c64f0e919bb3fa14908257fe15a95783/lodameratafuwifexuwomosez.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83ada68b8---penebabafasolom.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/jolusajiganefewe.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079111dabc61---lujisipore.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/vejosujalafasenukutolukuf.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b6afa04---39757461197.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/70985997192.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/japeraze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 14804 bytes
SHA-256: d24cf01bca726596bdc8bf5586c486a7cc400496fe9881e046232abfd60e99ad
font_01_sfnt_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 10592 bytes
SHA-256: b802e136521db8fe25be35401ab7aa1b93461e6e1c6b7569741a2bbf375eb025
font_02_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 1792 bytes
SHA-256: e4297377c175142b87baf1a77b899d5f77d79804bbb920b24eec5cc24ce383ee

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