Malicious PDF — malware analysis report

Static analysis result for SHA-256 478b16f9fc0cf65d…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 15:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263f29ab347ffa669b22c587fdca3f32 SHA-1: 4521de97488ed9329b464d75b7b4e20a48b0ee9a SHA-256: 478b16f9fc0cf65d50a17ba70a28e3bb4e1cf2ef4882f8a1e59fd8860715b35d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to redirect users to various external websites. Several of these links point to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://provia-events.de/pics/fotos/1/file/93394225036.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e69b3aa3c99e2f0601fdff8e8874c9d5/99988636171.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r8dici24e5q8uacdinlqp26ci4/99271584287.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/90521298627.pdfIn PDF document text
    • https://ubranni.com/uploader/files/lidojimufe.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/zivadozegixilu.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/wazosajuwokox.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/64735104907.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/zaxegafoxonit.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210816160849.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/6095956962.pdfIn PDF document text
    • http://emaaravm.net/upload/files/gupodifejozofekidonom.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607740ef4afcb---zezibaganexoduwusib.pdfIn PDF document text
    • https://lesura.net/userfiles/file/91013758753.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tudazigesosakadewewako.pdfIn PDF document text
    • http://slsnn.ru/content/file/87822575874.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9cc5d3ee2f61dd51497692f464ba66a6/35542519413.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7efi66kco6p9lghgml9p747dnd/80527044644.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/bonunu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b810f197d74---22061505399.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/tifaxopesa.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd8b514e9e---50927021535.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/35137597659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fractional+scale+factor+worksheet+tesPDF link annotation
    • 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_off0000bb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 10588 bytes
SHA-256: 791e83428f71128adcb082a1095beb51d07d3360425d26106c3e47d957f4c75d
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 17928 bytes
SHA-256: a529f6d0c57ff023a2ad9511e64c5bc10417a34b7d953bb9fa62807a8960d93f

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