Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff1bbbb22894b1d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 16:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55c64a64eee1991c8a18e41bae87bace SHA-1: 6044b07ef1edcea72cdcc828b95b39220af13095 SHA-256: 9ff1bbbb22894b1dffbfa01d7eecf86cbe5f5068f91b9eb398bc03f94a3cf3fa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=saw+movie+watch+free+online PDF link annotation
    • https://myshalewell.com/userfiles/file/pebipaferajawajoxagono.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/31cefe909c278ca1a1a984e1e3061487/75058629043.pdfIn PDF document text
    • http://fteq.ru/files/file/16195781365.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/jewudut.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/nunaxaxerakatovagobo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8kd6b31tp4seumvueii5d8oion/51443253483.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6395c34f2ecfedf42389ffa52d425f08/nuxepatadabavurogi.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/50323569998.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef5cf465---fivonara.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///17976157375.pdfIn PDF document text
    • http://sbairs.com/datas/files/80235441754.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/watunawo.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/38852892038.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/mojigerifis.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/xavoxegugutixagizopidut.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/sejanemamada.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/mijipeduluxokosuxapijexoz.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/sozibakofe.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/47808246614.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/3144546108.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/sidutibegavulokopoxunej.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/99697812124.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/80216078110.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/61320602821.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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 17596 bytes
SHA-256: 5dd11b9618cde970666b64d2f762a5344a7ea41725f7b35c268d725f3933c635
font_01_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5A 10660 bytes
SHA-256: 314bf10b4548061e030e1e25da2ab6c38f67ba8bc198f1342e8aade1b12bd8be

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