Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6c843d88ae1608…

MALICIOUS

PDF

92.2 KB Created: 2021-09-19 23:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b7d1d0f78cc94d1c7ca901a73ef7f8d SHA-1: 7a8b6e479821c35e75d23e7b80dbc72abfdcf097 SHA-256: ee6c843d88ae1608cfecfce5502373a32185d2964e2aa804d26d62112d27a486
164 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=indian+idol+first+season+finalist PDF link annotation
    • http://ig-einheitsloks.de/medien/file/26909846038.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xufelukojosetasosi.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/26218091467.pdfIn PDF document text
    • https://nexapos.com/upload/files/loledubulebozilasasiz.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/garuzeputirovimutav.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e5af295ee---texumix.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50615709190.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc692bc1e3---kopemutubusarulonirepuni.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/xexisesuzagidepesenek.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/nebaxubezokokipatotiz.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/25518083256.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/19129447750.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/xonumaritafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/selinuluxetetojepu.pdfIn PDF document text
    • https://angkalaris.com/contents/files/69384953203.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/lapuwaputejaxu.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/69485435926.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zatowu.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gemededamelumidek.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/gatem.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/78753022416.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210905_224604.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/penurizav.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_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 19372 bytes
SHA-256: 62faf7d5b13fa0fa0796bb328b1eebf64c6fd71d61e79227628421923f366877
font_01_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 10300 bytes
SHA-256: a7aa5e2eaf60b7dad6fce68fe8f0777ad664dd00fc081feda7609dc134ecf477
font_02_sfnt_off00014b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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