Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e652f752257699f…

MALICIOUS

PDF

98.5 KB Created: 2021-07-02 07:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a6675e7db5b2ac40caf5baa04253a89e SHA-1: 8d2e99439d9a736f8cf2655fb598d1c3d1d8ca79 SHA-256: 9e652f752257699f30f7652086c5d51000f72f413765aa4927c01ffa7a971583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://pistant.ru/uplcv?utm_term=use+suffuse+in+a+sentence PDF link annotation
    • http://hndgyl.com/v15/Upload/file/2021652342108574.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3c9f57eb1268a4af0cb9d98ba0c6760b/besugopejilajenorijisubu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/avhshu08ov1co9dkmbf7mrgcbl/15131384017.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbe930430---fekakuj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v89mpd9lj91m2uhleah7t3u3d7/8307349517.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/11865905678.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n9om7ksnm5teel04l843g7eo52/bujajarip.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3c52go84b1oqqj0tclf1313lo5/gonirelit.pdfIn PDF document text
    • https://aashianarealty.com/file/semewukoza.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f812d4d5d7---futopijusuf.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bkktsreib2savkuvdu8qkuqu1p/66107341718.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf3c5bc935---najufoluloxafozenu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160779d1172f12---wonixu.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/4efecac9050b327e9f37c414322f8c5c/motaruvozegagaluvorutoj.pdfIn PDF document text
    • https://sinarwaja.com/account/files/19955353370.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9eb08061---rujufimuw.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65185177164.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/u8tk7f20n2q3e833afn2a00eu2/97920671757.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafffe2212---dewadodanabudididebef.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f08cd0261---69031307011.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094283bdd700---96805720126.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 20628 bytes
SHA-256: 49220b0b2cbc5c31e6e671332783a3fd1bc667f511110af6d393c6a5c7ca9fed
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14011 16488 bytes
SHA-256: 26565bf5efc2e9b13b23bddc00da7a8dbe444a79b1a70082a83f0f170b24e842
font_03_sfnt_off00015709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15709 2980 bytes
SHA-256: 97162eaf907dd07de3c76207d6050d44a219028382c108130afbb481db1f1baf
font_04_sfnt_off00016399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 10172 bytes
SHA-256: 3435c8336e70514f43a86736d5f2c7a484f062920010b3678e4603350941d558

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