Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c998e06d539b3b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 02:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d33f6cdc516493ccedcd2e0df8c8861 SHA-1: 2267b18a2eebbd47c9c06541ced4a3036f8c6f15 SHA-256: b6c998e06d539b3b416864bb8b1023da4b655fcf076baa819c65860bf7c71a8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to create a network of links, potentially to improve search engine ranking for malicious content or to distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=onmovies+pro+apk+download PDF link annotation
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9jhfikll6ka6nogvhkqh60h9fb/1526653537.pdfIn PDF document text
    • https://senegal4d.com/contents/files/91172523740.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b530e8a64---lipadojezano.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/54334912572.pdfIn PDF document text
    • http://rotang.net/userfiles/file/wegiwuzezobexowejasenal.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/jujosotoviraxi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b0985ba07a02c97ec63c04608008b794/59485782066.pdfIn PDF document text
    • http://actinq.nl/upload/file/nekofokidaxofuneje.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/82207323077.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/91370291006.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/lisuwime.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/31897407616.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0afdce269e9968b5a195e3602d7d9e80/2811927609.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/winusavomofexilemubaw.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/zesitubareritegamet.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/buraxoziruna.pdfIn PDF document text
    • http://scantech3d.com/files/wulubojejosebasoxuxagud.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/66611844533.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/afab765ade4fcd712079bfe47f5812ba/85387674548.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ed64dedb3513a859514fa3cfc582f87b/xotosisavatusininode.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26053fe7---menegelofixajuxusupadeda.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/luwifafusobojapigigodorix.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/36923256462.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/10385245948.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/49539823834.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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 10724 bytes
SHA-256: dde3674114f809f321c1277d33b95f3b426c591bc76545626c603becef64f886
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 17008 bytes
SHA-256: 338e70c9c6927c4b2a31661316804f8799f3841c35bdc0cc853665814269e663

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