Malicious PDF — malware analysis report

Static analysis result for SHA-256 875b54d20ea2870d…

MALICIOUS

PDF

88.0 KB Created: 2021-10-01 01:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f9e91a00124fd2220a4fcc19b4136c8f SHA-1: d9716f1f8c9568dfc11272c36e41bda3e80d6840 SHA-256: 875b54d20ea2870d7def5889e4fb41f8b146ae2d94e528a37455027335b79329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely via spearphishing, to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=dream+league+soccer+2014+apk+and+obb+download PDF link annotation
    • http://dreamwith.gni.kr/ckupload/files/zelisezofepepevuvosikep.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/rugimasufinakinupus.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fdf1fe09---babetizakofadugu.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/poziwi.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/59423115091.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134817816bbe---pagopuriveduxigotaju.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/21624135688.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/17489223890.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/ripizob.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42823143522.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/gitisavezamuxotujolom.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q9pqpf3d4me4ft393mlkgcsvq3/25555680872.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/wufezeboxepidiseji.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/gitorimavamagip.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/87586027828.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/nifamejimop.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/54052711183.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/pubawekozudu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021914555205512.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/81975171399.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/72496532935.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/98968464038.pdfIn PDF document text
    • https://songhongresort.com/img/files/35057049014.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 22668 bytes
SHA-256: ec8382d1ff2ae7bfade33a613d5294540009dd50d60d17543a201a186a4c7fc6
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 11456 bytes
SHA-256: 81d736576f62e70f8f59b991bb9b8cf4054e4e1790cae494b6a88ed2d0894dac
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001379f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379F 16792 bytes
SHA-256: c8d112e3b3c74f00aee7ff64595c4f26ebbcda1f9ff8dd10d342c18135eae519

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