Malicious PDF — malware analysis report

Static analysis result for SHA-256 192898b8ec39b59b…

MALICIOUS

PDF

92.7 KB Created: 2021-09-11 06:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2bc982f29ed1ec2e3d2df7ce075b272a SHA-1: 0b81348e507dce33c280f600f9b425f3fa86aa27 SHA-256: 192898b8ec39b59ba2e6f6cd9cc385ab51bd4705030c22aff934ec4912e60cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c99a5633---90438754484.pdf In PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/gibanusitinepuwagujazini.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/34159992637.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/4082725614.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5817495f---gelevadokazulitoresu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d945bdde9bdffb9003df08607abc9e32/84385943234.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/46109057535.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/nenifotesugog.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613116e30b614---nugesu.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/59634619011.pdfIn PDF document text
    • http://gensugroup.com/upload/files/tumezijedexisoja.pdfIn PDF document text
    • https://ismart99.net/upload/files/vozaxapoboxigu.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906024531.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/wopitamedojipi.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/sirulusamemobo.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/49314469522.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/pivakexubir.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/pofamaxefofupitilefut.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/filifokenexeribijeguwep.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/monumoroduleso.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/lavokifa.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/piwamefipobagew.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/beranunoriwezimefajolop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+9+pro+supports+33w+chargerPDF link annotation
    • 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_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 19764 bytes
SHA-256: bc5bd430a8f462585357044d5a2ab68815ee4d5d4df80bcdb141255277d1fff7
font_02_sfnt_off00014a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0F 11484 bytes
SHA-256: b1ddd2d382b398d698699586d09d1931fdd76124b8775f59e04832be0d2278e3