Malicious PDF — malware analysis report

Static analysis result for SHA-256 8892a2c6ea010f9a…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 03:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38a1b7ce3aa664cf3045cfca2783ccfb SHA-1: b16ce0e8ca5d90670718c7f8997b69556ed23575 SHA-256: 8892a2c6ea010f9abe768cb6dbdae682e497374eb9e70fd67beabaa514f44ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of link farms on disposable or compromised hosting. No scripts were extracted, but the PDF structure itself is designed to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=informative+presentation+pdf PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0c4d11c9814ff6a532fc49670347faae/62497688238.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9a2b23487a9abacce36cc3e8719f1376/46852428178.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/87518350592.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f846f2b3fe8c294cda9be4943d3373a0/wofawedesebogakozutawisag.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/tunofiginutejotujuxefuba.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/11830342874.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xarojemenusisolapeler.pdfIn PDF document text
    • https://majubesar.com/contents//files/tumovoreb.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd5aedf94---19916436153.pdfIn PDF document text
    • http://z500.si/files/85463710314.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17faa71001369d262663954d21e86677/84906094099.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/fefad.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607303aef3680---89025610991.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/49460430392.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/10571530397.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6800ac925f---funadasaxusobevakiwim.pdfIn PDF document text
    • https://begili.com/uploads/image/files/61683277753.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/jibatunabuborapomikebu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e8a478c1b9fc79449d8ede196bceec88/sudatubenenonudezosadegil.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ur5lcmp0as426p34c0ddlgjbp2/paroxalew.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/mopegoza.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb8cb3dac---9188068305.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/67121539572.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/188ecd7415c9abbcf9426ba57117afdb/xuxusep.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/66962427177.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_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 17240 bytes
SHA-256: 89ef8fb1e067a6f44a8590506041ff79c63fb1fb88d6d4f8de65de3d82205475
font_01_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 10632 bytes
SHA-256: c566fecb4268e152871c0f74e84078adece9256c36bb295720018898e11a04f1
font_02_sfnt_off00013d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1