Malicious PDF — malware analysis report

Static analysis result for SHA-256 244bca87bd409f30…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 02:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 559804b1713a8151daa4cdd4982a162e SHA-1: 49a5a011719435bbc0c11befafb92b5ee4ba83f5 SHA-256: 244bca87bd409f30eed52c65a9ad293ede924a5a56f9d04f87081fbd78364925
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=isgott+6th+edition+free+download PDF link annotation
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/49454764335.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xalepibolezon.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vutakogalaliwimogususewir.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf127b86d94---40635248316.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vexevi.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/77488935685.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfbcc926f---gaxatenokidivitovezid.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ff3bd893---zerewudaxoxolenen.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/22675378151.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/20088677524.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/temulujalekuxapurule.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113b8ed571---7453507277.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d59c446af---fakaved.pdfIn PDF document text
    • http://blueyee.com/upload/file/102144585205.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/39277931650.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6226ef09b2---garugutadobiwuzibanip.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/35017756336.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/zupesevevutusugib.pdfIn PDF document text
    • http://coffee33.ru/archive/file/36976916196.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6c6da372b9d1c6f2fd52949be993d719/xexonanetejewazemo.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/xomiguwimapadofi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ad68e6c0c77976907dcfa3a9e95df1d3/kutiseler.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/2135704225.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9dbh2vgs5iviv5qqlpno6jllpt/mifotetepevixojanitekidu.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/kusow.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612017e659bbc---lekerazefi.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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10840 bytes
SHA-256: 412eb74de246d99e9ee6450dc3574ec505f88c9ac54fd4d40a12b8a099d4e8be
font_02_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 16596 bytes
SHA-256: 75cc527245953c53b6936c75c4444d4895188ee723176693ac4177999a6810d8