Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f68a20bd300a98a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 21:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63c81d541028b36f278092cadab78d89 SHA-1: 77805c835615dd79957a8e83da50bd30500f23bf SHA-256: 6f68a20bd300a98a98d8d289723f1f53264f4d394c89029c450066ffb3a12cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics as a malicious PDF, including a high-confidence ML classification and ClamAV detection. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=how+to+fill+out+a+large+envelope PDF link annotation
    • http://gcsiva.com/files/userfiles/file/navalegakababobawinidov.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/janikonurewuteni.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210901_060537.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gapuzadodanelizew.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/77818787669.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/69403148670.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/65b93c8b2b808b45ab5fe239713e9b9c/niboroj.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/7642784317.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/10011084615.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140d99d72fd4---kiguduvejetutemewaze.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/subunarusejidopo.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/16691611353.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/72798243967.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210911223035_2wkkvg.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae4e570fc---gejipukafuvumabusipenegab.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/36086419602.pdfIn PDF document text
    • http://nktrading.qa/file/files/55814480454.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/salikaxowigagesomemowu.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/79630151626.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/dawegagum.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d206a0635b---jijamivozuzatovakixemike.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/tizojokasumawexa.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/dibobodumuriguzi.pdfIn PDF document text
    • http://geodez.com/pliki/file/jopisotaditexido.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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 16752 bytes
SHA-256: 33b918fd45717ec05a7188fc360d58735d1351cadc4e1c7b7b69639bf7932c1e
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 10608 bytes
SHA-256: 01adb9a82f08d8276b6bf413396832d7799e998512f983b68ab4e73e9dfa351d

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