Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa9ece3d31c9db0…

MALICIOUS

PDF

93.5 KB Created: 2021-06-29 02:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ea29991f59af1d62b7ab2c52ae911768 SHA-1: 00531386cd7eb5c790f85f36557bc51f22ff0805 SHA-256: bfa9ece3d31c9db06186ffd865b1996bf0d9a2cd9eac51bb3e6e38997eaab8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it acts as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=take+care+other+words PDF link annotation
    • http://pro-group.ru/userfiles/files/97196687393.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca223181e---87116085138.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abb47e6c4f9---96714289417.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/11224460249.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bc9bb50f7a468c139975c85d75db7b76/98218947333.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pexuranivajibowudemiwa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafcb15b64---zijeje.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/luunpc3sdgg30c66pt1scf9nfi/74431702325.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/delewudezenulatibifixabos.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d53c8fa6---jugikaxigegumedanid.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/nezaretubexexapofivanid.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f43cf06a---pobanulemejogowe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm9r79v6orn9h0tm8oalsbv7vs/xenizarajewivorosuvixujaj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72198a8d7---xobodobutazaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ace48a20a---nuxodubuvaduxenojikubo.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/8840a8d46e075a9fd2b7d32a7d99b522/70636992098.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/63301937662.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/lg64a3uk31a8eqimf3v7nli7s1/velexude.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1066ce835---27906516314.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/31421714659.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a937692d9d4---rofafusaxiwenifumimem.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b3c0fc4f---lukedugudenotazivegatiri.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/04ad4d4ad1694afdcd0c364fc62ccd97/71486800943.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_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 17288 bytes
SHA-256: d2ebf22cfe62f033f8f334ac5dc48a4c58463156608fcd2464615be600e06330
font_02_sfnt_off00014fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDA 10368 bytes
SHA-256: d7a1fbfa07e64c24bfff1ed3e2caa3955a3731179201085aaf0f0c45eb636a9b

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