Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cdc446ad114a19…

MALICIOUS

PDF

88.3 KB Created: 2021-09-23 07:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a7bb469986b99dece225ff89ce62c9d SHA-1: 9c2a585789f2eb3896d4d8f58bed49667249c237 SHA-256: d6cdc446ad114a19ba52ff9ca894c29ad9a62b29d4276e6335384efa80e497ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or 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, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://drafthe.ru/uplcv?utm_term=drum+tuner+pro+apk+free+download PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5cb5eac808f5339ed6554c6acd52634a/88050850379.pdfIn PDF document text
    • https://mediaskills.rs/files/22021835005.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632347195.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/95225633585.pdfIn PDF document text
    • http://idroter.org/userfiles/files/24533432936.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/94844015718.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/mijakepu.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/wedinivufuwag.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487080d8e3c---49082353276.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/sofawilelikozavirujupali.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xekefivizaxexixu.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/19943099599.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab1b8cce3c63f5dd9e82d57bc45a6a2f/70556381750.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/26302197349.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/gevajifaji.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/kefigep.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/97472858205.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/77096862155.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/98488871971.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/180320121812.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dinaniluzurab.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/mazoxuk.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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 16576 bytes
SHA-256: 3577c13b5ae24019d6cccb3cd29032a150fd605d830eaa276394137d45e0bc57
font_01_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 24828 bytes
SHA-256: 550c0d9fa78482be4a1d5f1cfab88f775e3b22776c549b9cdc69152a3c9c0a8e
font_03_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 10676 bytes
SHA-256: 13a15d071530912ca0ee6153525d5121b4f26073751d667c7411d4d0bd2776c1

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