Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efed9b0d3d94fb7…

MALICIOUS

PDF

84.0 KB Created: 2021-08-17 07:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6071cda9c3c5f6511ed3633a987993d2 SHA-1: 3987203f155cc052caa440d746adbab2880dd1a4 SHA-256: 3efed9b0d3d94fb710f96b0c9475a0567ed5589c6798bc152c625b8ecfb64de2
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. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and a link farm structure suggests the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://chcial.ru/uplcv?utm_term=how+to+use+hoover+steamvac+attachment PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/030d84e24df9d987f5b168e6cd51a729/61936223076.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/zebogumojesapedakowoniw.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/getoxuwujuzuwazegokeki.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/35681486571.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c14898de0---14827134539.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/18130812683.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/bajejekakavizeriruni.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//82429871876.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75af05c560---muropalewixodenizapepet.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/13434725116.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4b855f496789cf1f8e7f9cb167921e61/ganoreligagevoxij.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///40715951679.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/risadedujujavine.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/15255275097.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/sojusenidalorilipanoge.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/gimebasagofezesimobubadi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cceba549---86755855608.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/36140731968.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/28/file/20210528_152452_177.pdfIn PDF document text
    • https://buka.ru/sadm_files/tedenisadun.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fujaliwo.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/zajural.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/42b0a2671e658e879a57c75a03e9fe22/5468339347.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ee6mpu713q3f3vd9m6vlvvpuvs/pobedajamugoneneluzurek.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/xofijin.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6af16c2a---56485293169.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/40f72e94f89baf08f5a046ab94caf7bf/rapudapevuderifajekolidu.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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 10600 bytes
SHA-256: 3edfcde2dbf156aeb7567c32d7aa17dff51955ad86fc6f4b1f5ee15850570b17
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 17368 bytes
SHA-256: e735f7157a471ef56b6a555c53285e7cbc9e364af14f7e9b3d884c9da757cef9

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